Prof. Dr.-Ing. Johannes Kiefer, CEng CSci MIChemE MRSC

Articles (peer-reviewed journals)

(123 articles, h-index: 25)

[1] M. Stuckenholz, E. Crespo, L. Vega, P. Carvalho, J. Coutinho, W. Schröer, J. Kiefer, B. Rathke Vapor liquid equilibria of binary mixtures of 1-butyl-3-methylimidazolium triflate (C4mimTfO) and molecular solvents: n-alkyl alcohols and water Journal of Physical Chemistry B, accepted 2018.

[2] J. Kiefer The danger of relying on database spectra Applied Spectroscopy, accepted 2018.

[3] J. Kiefer, L. Burg, A.P. Williamson Absorption, emission, and Schlieren imaging of liquid and gas flows using an LED and a webcam Technisches Messen, accepted 2018.

[4] A. Durazzo, R. Maggio, J. Kiefer, M. Lucarini, S. Marconi, S. Lisciani, E. Camilli, L. Gambelli, P. Gabrielli, A. Aguzzi, E. Finotti, L. Marletta An Innovative and Integrated Food Research Approach: spectroscopy applications to milk and a case study of a milk-based dish Brazilian Journal of Analytical Chemistry, accepted 2018.

[5] J. Kiefer, J. Bartels, S. Kroll, K. Rezwan Vibrational spectroscopy as a promising toolbox for analyzing functionalized ceramic membranes for virus retention Applied Spectroscopy, accepted 2017.

[6] A.I. Lampe, A.K. Dittmar, C. Heyen, J. Kiefer Butanol as a potential biofuel: A spectroscopic study of its blends with n-decane and diesel Fuel 222, 312-318 (2018).

[7] J. Kiefer, A. Stärk, A.L. Kiefer, H. Glade Infrared spectroscopic analysis of the inorganic deposits from water in domestic and technical heat exchangers Energies 11, 798, 8pp (2018).

[8] J. Kiefer, K. Eisen Unsupervised screening of vibrational spectra by principal component analysis for identifying molecular clusters ChemPhysChem 19, 795-800 (2018).

[9] J. Kiefer, M. Stuckenholz, B. Rathke Influence of the alkyl chain on the vibrational structure and interionic interactions in 1-alkyl-3-methylimidazolium trifluoromethanesulfonate ionic liquids Journal of Molecular Liquids 255, 413-418 (2018).

[10] J. Kiefer, S. Wagenfeld, D. Kerlé Chain length effects on the vibrational structure and molecular interactions in the liquid normal alkyl alcohols Spectrochimica Acta A 189, 57-65 (2018).

[11] J. Kiefer, A.L. Cromwell Analysis of single malt Scotch whisky using Raman spectroscopy Analytical Methods 9, 511-518 (2017).

[12] F. Meierhofer, H. Li, M. Gockeln, R. Kun, T. Grieb, A. Rosenauer, U. Fritsching, J. Kiefer, J. Birkenstock, L. Mädler, S. Pokhrel Screening precursor-solvent combinations for Li4Ti5O12 energy storage material using flame spray pyrolysis ACS Applied Materials & Interfaces 9, 37760-37777 (2017). (featured as journal cover page)

[13] B. Haddad, D. Mokhtar, M. Goussem, E. Belarbi, D. Villemin, S. Bresson, M. Rahmouni, N.R. Dhumal, H.J. Kim, J. Kiefer Influence of methyl and propyl groups on the vibrational spectra of two imidazolium ionic liquids and their non-ionic precursors Journal of Molecular Structure 1134, 582-590 (2017).

[14] A.L. Sahlberg, D. Hot, J. Kiefer, M. Aldén, Z.S. Li Mid-infrared laser-induced thermal grating spectroscopy in flames Proceedings of the Combustion Institute 36, 4515-4523 (2017).

[15] A. Ehn, J. Zhu, X. Li, J. Kiefer Advanced laser-based techniques for gas-phase diagnostics in combustion and aerospace engineering Applied Spectroscopy 71, 341-366 (2017).

[16] N. Jüngst, A.P. Williamson, J. Kiefer Numerical model for predicting experimental effects in enantioselective Raman spectroscopy Applied Physics B 123, 128, 15pp (2017).

[17] J. Kiefer Using a supercontinuum light source for instantaneous excitation-emission fluorescence mapping Measurement Science & Technology 28, 067001, 4pp (2017).

[18] J. Kiefer, A. Bösmann, P. Wasserscheid Quantitative measurement of complex substances dissolved in an ionic liquid using IR spectroscopy and chemometrics TM – Technisches Messen 84, 32-37 (2017).

[19] J. Kiefer Comment on „Red/blue shifting hydrogen bonds in acetonitrile - dimethyl sulphoxide solutions: FTIR and theoretical studies" DOI: 10.1016/j.molstruc.2017.03.036 Journal of Molecular Structure 1143, 487-488 (2017).

[20] J. Kiefer, J. Rüger, F.M. Zehentbauer A priori performance estimation of spatial filtering in Raman backscattering experiments Spectroscopy 32, 56-61 (2017).

[21] N.R. Dhumal, J. Kiefer, D. Turton, K. Wynne, H.J. Kim Dielectric relaxation of the ionic liquid 1-ethyl-3-methylimidazolium ethyl sulfate: Microwave and far-IR properties Journal of Physical Chemistry B 121, 4845-4852 (2017).

[22] M.P. Singh, N.R. Dhumal, H.J. Kim, J. Kiefer, J.A. Anderson Removal of confined ionic liquid from a metal organic framework by extraction with molecular solvents Journal of Physical Chemistry C 121, 10577-10586 (2017).

[23] J. Kiefer, M.N. Radzuan, J. Winterburn Infrared spectroscopy for studying structure and aging effects in rhamnolipid biosurfactants Applied Sciences 7, 533, 7pp (2017).

[24] J. Kiefer, G. Wei, L. Colombi Ciacchi, E. von Lieres Irreversible damage of polymer membranes during attenuated total reflection infrared analysis Applied Spectroscopy 71, 1127-1133 (2017).

[25] S. Corsetti, T. Rabl, D. McGloin, J. Kiefer Intermediate phases during solid to liquid transitions in long-chain n-alkanes Physical Chemistry Chemical Physics 19, 13941-13950 (2017).

[26] J. Kiefer Simultaneous acquisition of the polarized and depolarized Raman signal with a single detector Analytical Chemistry 89, 5725-5728 (2017).

[27] B. Haddad, A. Paolone, D. Villemin, M. Taqiyeddine, E. Belarbi, S. Bresson, M. Rahmouni, N.R. Dhumal, H.J. Kim, J. Kiefer Synthesis, conductivity, and vibrational spectroscopy of tetraphenylphosphonium bis(trifluoromethanesulfonyl)imide Journal of Molecular Structure 1146, 203-212 (2017).

[28] J. Kiefer, K. Noack, T.C. Penna, M.C.C. Ribeiro, H. Weber, B. Kirchner Vibrational signatures of anionic cyano groups in imidazolium ionic liquids Vibrational Spectroscopy 91, 141-146 (2017). (invited article for the Prominent Young Spectroscopists Issue) (ranked 22nd in the journal’s top downloaded papers in October 2017)

[29] M.M. Kazemi, M. Namboodiri, P. Donfack, A. Materny, D. Kerlé, B. Rathke, J. Kiefer Influence of the alkyl side-chain length on the ultrafast vibrational dynamics of 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide (CnmimNTf2) ionic liquids Physical Chemistry Chemical Physics 19, 15988-15995 (2017).

[30] P.B.P. Serra, M.A.A. Rocha, B. Rathke, K. Ruzicka, M. Fulem, J. Kiefer Infrared spectroscopy of the symmetric branched isomers of n-heptanol Journal of Molecular Liquids 244, 528-532 (2017).

[31] J. Kiefer, J. Zetterberg, A. Ehn, J. Evertsson, G. Harlow, E. Lundgren Infrared spectroscopy as molecular probe of the macroscopic metal-liquid interface Applied Sciences 7, 1229, 7pp (2017).

[32] J. Kiefer Simultaneous acquisition of absorption and fluorescence spectra of strong absorbers utilizing an evanescent supercontinuum Optics Letters 41, 5684-5687 (2016).

[33] J. Kiefer, A.L. Sahlberg, D. Hot, M. Aldén, Z.S. Li Misalignment effects in laser-induced grating experiments Applied Spectroscopy 70, 2025-2028 (2016).

[34] K. Grüber, J. Kiefer Advanced instantaneous shifted-excitation Raman difference spectroscopy (iSERDS) using a laser pointer Journal of Raman Spectroscopy 47, 1049-1055 (2016). (invited article)

[35] J. Kiefer, A. Materny, J. Moger, H. Offerhaus, P.P. Radi, A. Volkmer, A.M. Zheltikov Advances in nonlinear optical spectroscopies: A historical perspective of developments and applications presented at ECONOS Journal of Raman Spectroscopy 47, 1111-1123 (2016).

[36] P.S. Hsu, M. Gragston, Y. Wu, Z. Zhang, A.K. Patnaik, J. Kiefer, S. Roy, J.R. Gord Sensitivity, stability, and precision of quantitative ns-LIBS-based fuel-air ratio measurements for methane-air flames at 1-11 bar Applied Optics 55, 8042-8048 (2016).

[37] S. Corsetti, D. McGloin, J. Kiefer Comparison of Raman and IR spectroscopy for quantitative analysis of gasoline/ethanol blends Fuel 166, 488-494 (2016).

[38] N.R. Dhumal, M.P. Singh, J.A. Anderson, J. Kiefer, H.J. Kim Molecular interactions of a Cu-based metal organic framework with a confined imidazolium-based ionic liquid: A combined density-functional theory and experimental vibrational spectroscopy study Journal of Physical Chemistry C 120, 3295-3304 (2016).

[39] R. Reisenhofer, J. Kiefer, E.J. King Shearlet-based detection of flame fronts Experiments in Fluids 57, 41, 14pp (2016).

[40] A.P. Williamson, J. Kiefer Polarization-controlled optical ring cavity (PORC) tunable pulse stretcher Optics Communications 372, 98-105 (2016).

[41] K. Becker, J. Kiefer Combined spontaneous Stokes and coherent anti-Stokes Raman scattering spectroscopy Applied Physics B 122, 127, 9pp (2016).

[42] A.L. Sahlberg, J. Kiefer, M. Aldén, Z.S. Li Mid-infrared pumped laser-induced thermal grating spectroscopy for detection of acetylene in the visible spectral range Applied Spectroscopy 70, 1034-1043 (2016).

[43] M.P. Singh, N.R. Dhumal, H.J. Kim, J. Kiefer, J.A. Anderson Influence of water on the chemistry and structure of the metal-organic framework Cu3(btc)2 Journal of Physical Chemistry C 120, 17323-17333 (2016).

[44] J. Kiefer, K. Frank, F.M. Zehentbauer, H.P. Schuchmann Infrared spectroscopy of bilberry extract water-in-oil emulsions: Sensing the water-oil

interface Biosensors 6, 13, 11pp (2016) (invited Feature Article)

[45] D.K. Singh, B. Rathke, J. Kiefer, A. Materny Molecular structure and interactions in the ionic liquid 1-ethyl-3-methylimidazolium trifluoromethanesulfonate Journal of Physical Chemistry A 120, 6274-6286 (2016).

[46] J. Kiefer, J. Grabow, H.-D. Kurland, F.A. Müller Characterization of Nanoparticles by Solvent Infrared Spectroscopy Analytical Chemistry 87, 12313-12317 (2015). (ranked 15th in the journal’s top downloaded papers in December 2015)

[47] S. Corsetti, R.E.H. Miles, C. McDonald, Y. Belotti, J.P. Reid, J. Kiefer, D. McGloin Probing the evaporation dynamics of ethanol/gasoline biofuel blends using single droplet manipulation techniques Journal of Physical Chemistry A 119, 12797-12804 (2015). (highlighted in the virtual special issue “Atmospheric Physical Chemistry” in July 2016)

[48] V.M. Wallace, N.R. Dhumal, F.M. Zehentbauer, H.J. Kim, J. Kiefer Revisiting the aqueous solutions of dimethyl sulfoxide by spectroscopy in the mid- and near-infrared: experiments and molecular dynamics simulations Journal of Physical Chemistry B 119, 14780-14789 (2015). (ranked 7th in the journal’s top downloaded papers in November 2015)

[49] F.M. Zehentbauer, J. Kiefer Molecular solution behaviour of an intermediate biofuel feedstock: acetone-butanol-ethanol (ABE) ChemPhysChem 16, 3846-3858 (2015).

[50] J. Kiefer, B. Zhou, Z.S. Li, M. Aldèn Impact of plasma dynamics on equivalence ratio measurements by laser-induced breakdown spectroscopy Applied Optics 54, 4221-4226 (2015).

[51] J. Kiefer Quantitative enantioselective Raman spectroscopy Analyst 140, 5012-5018 (2015). (ranked 9th in June and 8th in July 2015 in the journal’s most downloaded papers) (highlighted in Atlas of Science, 12 Dec 2015)

[52] J. Kiefer, M. Namboodiri, M.M. Kazemi, A. Materny Time-resolved femtosecond CARS of the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate Journal of Raman Spectroscopy 46, 722-726 (2015).

[53] J. Kiefer, F. Toni, K.E. Wirth Influence of carbon coated iron nanoparticles on the Raman spectrum of liquid ethanol Journal of Raman Spectroscopy 46, 1124-1128 (2015).

[54] J. Kiefer Recent advances in the characterization of gaseous and liquid fuels by vibrational spectroscopy

Energies 8, 3165-3197 (2015). (invited review article)

[55] J. Kiefer, K. Noack Universal enantiomeric discrimination by Raman spectroscopy Analyst 140, 1787-1790 (2015). (featured as ‘hot article’ and highlighted on the journal blog)

[56] J. Kiefer, B. Zhou, Z.S. Li, M. Aldèn Impact of plasma dynamics on equivalence ratio measurements by laser-induced breakdown spectroscopy Applied Optics 54, 4221-4226 (2015).

[57] S. Corsetti, F.M. Zehentbauer, D. McGloin, J. Kiefer Characterization of gasoline/ethanol blends by infrared and excess infrared spectroscopy Fuel 141, 136-142 (2015). (featured as Key Scientific Article on Renewable Energy Global Innovations)

[58] D.N. Kozlov, J. Kiefer, T. Seeger, A.P. Fröba, A. Leipertz Simultaneous measurement of speed of sound, thermal diffusivity, and bulk viscosity of 1-ethyl-3-methylimidazolium-based ionic liquids using laser-induced gratings Journal of Physical Chemistry B 118, 14493-14501 (2014).

[59] J. Kiefer Instantaneous shifted-excitation Raman difference spectroscopy (iSERDS) Journal of Raman Spectroscopy 45, 980-983 (2014).

[60] J. Kiefer, B. Zhou, J. Zetterberg, Z.S. Li, M. Aldèn Laser-induced fluorescence detection of hot molecular oxygen in flames using an alexandrite laser Applied Spectroscopy 68, 1266-1273 (2014).

[61] A.P. Williamson, J. Kiefer Automatic low-cost method to determine the solubility of liquid-liquid mixtures by continuous flow titration Chemical Engineering and Technology 37, 1736-1740 (2014).

[62] M. Namboodiri, M.M. Kazemi, T.Z. Khan, A. Materny, J. Kiefer Ultrafast vibrational dynamics and energy transfer in imidazolium ionic liquids Journal of the American Chemical Society 136, 6136-6141 (2014).

[63] S.C. Eichmann, J. Kiefer, J. Benz, T. Kempf, A. Leipertz, T. Seeger Determination of gas composition in a biogas plant using a Raman-based sensor system Measurement Science and Technology 25, 075503, 9pp (2014).

[64] J. Kiefer, N.H. Rasul, P.K. Gosh, E. von Lieres Surface and bulk porosity mapping of polymer membranes using infrared spectroscopy Journal of Membrane Science 452, 152-156 (2014). (Journal’s Top 25 Hottest Articles October-December 2013; highlighted as research trend in Membrane Technology 2014, Issue 9)

[65] F.M. Zehentbauer, C. Moretto, R. Stephen, T. Thevar, J.R. Gilchrist, D. Pokrajac, K.L. Richard, J. Kiefer Fluorescence spectroscopy of Rhodamine 6G: Concentration and solvent effects

Spectrochimica Acta A 121, 147-151 (2014). (Journal’s most downloaded articles 2014-2016)

[66] N.R. Dhumal, K. Noack, J. Kiefer, H.J. Kim Molecular structure and interactions in the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide Journal of Physical Chemistry A 118, 2547-2557 (2014). (Journal’s Top 20 most read articles April 2014)

[67] B. Zhou, J. Kiefer, J. Zetterberg, Z.S. Li, M. Aldèn Strategy for PLIF single-shot HCO imaging in turbulent hydrocarbon flames Combustion and Flame 161, 1566-1574 (2014).

[68] A. Ellis, F.M. Zehentbauer, J. Kiefer Probing the balance of attraction and repulsion in binary mixtures of dimethyl sulfoxide and n-alcohols Physical Chemistry Chemical Physics 15, 1093-1096 (2013).

[69] J. Kiefer, M. Kaspereit Determination of the Raman depolarization ratio in optically active samples Analytical Methods 5, 797-800 (2013). (featured as journal cover page)

[70] J. Kiefer, Z.S. Li, A. Alden Laser-induced breakdown spectroscopy in a partially premixed turbulent jet flame Measurement Science and Technology 24, 075205, 6 pp (2013).

[71] A. Flügel, J. Kiefer, S. Will, A. Leipertz Broadband two-color laser-induced incandescence pyrometry approach for nanoparticle characterization with improved sensitivity Applied Spectroscopy 67, 1098-1100 (2013).

[72] K. Noack, B. Eskofier, J. Kiefer, C. Dilk, G. Bilow, M. Schirmer, R. Buchholz, A. Leipertz Combined shifted-excitation Raman difference spectroscopy and support vector regression for monitoring the algal production of complex polysaccharides Analyst 138, 5639-5646 (2013). (featured as ‘hot article 2013’ and highlighted on the journal blog)

[73] R. Adami, J. Kiefer Light-emitting diode based shifted-excitation Raman difference spectroscopy (LED-SERDS) Analyst 138, 6258-6261 (2013). (featured as ‘hot article 2013’ and highlighted on the journal blog)

[74] B. Roshani, A. Flügel, I. Schmitz, D.N. Kozlov, T. Seeger, L. Zigan, J. Kiefer, A. Leipertz Simultaneous measurements of fuel vapor concentration and temperature in a flash-boiling propane jet using laser-induced gratings Journal of Raman Spectroscopy 44, 1356-1362 (2013).

[75] M.A. Schmidt, J. Kiefer Polarization-resolved high-resolution Raman spectroscopy with a light-emitting diode Journal of Raman Spectroscopy 44, 1625-1627 (2013).

[76] F.M. Zehentbauer, E.J. Bain, J. Kiefer Multiple parameter monitoring in a direct methanol fuel cell Measurement Science and Technology 23, 045602, 6 pp (2012).

[77] J. Kiefer, M. Martinez Molina, K. Noack The peculiar nature of molecular interactions between an imidazolium ionic liquid and acetone ChemPhysChem 13, 1213-1220 (2012).

[78] K. Noack, A. Leipertz, J. Kiefer Molecular interactions and macroscopic effects in binary mixtures of an imidazolium ionic liquid with water, methanol, and ethanol Journal of Molecular Structure 1018, 45-53 (2012).

[79] F.M. Zehentbauer, J. Kiefer Detection of unexpected species in soft modelling of vibrational spectra Chimica Oggi/Chemistry Today 30, 54-56 (2012). (invited article)

[80] J. Kiefer, M.A. Cöngevel, D. Roth, K. Obert, P. Wasserscheid, A. Leipertz Attenuated total reflection infrared difference spectroscopy (ATR-IRDS) for quantitative reaction monitoring Applied Spectroscopy 66, 685-688 (2012).

[81] J. Kiefer, J.W. Tröger, Z.S. Li, T. Seeger, M. Aldèn, A. Leipertz Laser-induced breakdown flame thermometry Combustion and Flame 159, 3576-3582 (2012). (Journal’s Top 25 Hottest Articles October-December 2012)

[82] C.J. Kliewer, Y. Gao, T. Seeger, J. Kiefer, B.D. Patterson, T.B. Settersten Picosecond time-resolved pure-rotational coherent anti-Stokes Raman spectroscopy in sooting flames Proceedings of the Combustion Institute 33, 831-838 (2011). (Distinguished Paper Award of the Diagnostics Colloquium)

[83] J. Kiefer, F. Ossler, Z.S. Li, M. Aldén Spectral interferences from formaldehyde in CH PLIF flame front imaging with broadband B-X excitation Combustion and Flame 158, 583-585 (2011).

[84] S. Schorsch, J. Kiefer, S. Steuer, T. Seeger, A. Leipertz, S. Gonschorek, B. Abröll, M. Käß Entwicklung eines Echtzeitanalyse-Systems zur Charakterisierung von Brenngasgemischen in Gasturbinenkraftwerken Chemie Ingenieur Technik 83, 247-253 (2011) (featured as journal cover page, journal’s top 20 most cited papers 2010-2011)

[85] J. Kiefer, J.W. Tröger, Z.S. Li, M. Aldén Laser-induced plasma in methane and dimethyl ether for flame ignition and combustion diagnostics Applied Physics B 103, 229-236 (2011).

[86] N.R. Dhumal, H.J. Kim, J. Kiefer Electronic structure and normal vibrations of the 1-ethyl-3-methylimidazolium ethyl sulfate

ion pair Journal of Physical Chemistry A 115, 3551-3558 (2011).

[87] J. Kiefer, P. Ewart Laser diagnostics and minor species detection in combustion using resonant four-wave mixing Progress in Energy and Combustion Science 37, 525-564 (2011). (invited review article) highlighted in Fuel and Energy Abstracts 53(2) 2012, page 149

[88] D.N. Kozlov, J. Kiefer, T. Seeger, A.P. Fröba, A. Leipertz Determination of physicochemical parameters of ionic liquids and their mixtures with solvents using laser-induced gratings Journal of Physical Chemistry B 115, 8528-8533 (2011).

[89] J. Kiefer, K. Frank, H.P. Schuchmann Attenuated total reflection infrared (ATR-IR) spectroscopy of a water-in-oil emulsion Applied Spectroscopy 65, 1024-1028 (2011).

[90] J. Kiefer, K. Noack, B. Kirchner Hydrogen bonding in mixtures of dimethyl sulfoxide and cosolvents Current Physical Chemistry 1, 340-351 (2011). (invited review article) highlighted in ChemInform 44(25) 2013; doi: 10.1002/chin.201325225

[91] H.C. Struthers, F.M. Zehentbauer, E. Ono-Sorhue, J. Kiefer Chemical composition monitoring in a batch distillation process using Raman spectroscopy Industrial & Engineering Chemistry Research 50, 12824-12830 (2011).

[92] J. Kiefer, K. Noack, J. Bartelmess, C. Walter, H. Dörnenburg, A. Leipertz Vibrational structure of the polyunsaturated fatty acids eicosapentaenoic acid and arachidonic acid studied by infrared spectroscopy Journal of Molecular Structure 965, 121-124 (2010).

[93] J. Kiefer, N. Ebel, E. Schlücker, A. Leipertz Characterization of Escherichia coli suspensions using UV/Vis/NIR absorption spectroscopy Analytical Methods 2, 123-128 (2010). (featured as journal cover page; Journal’s Top 10 March 2010 and April 2010)

[94] K. Noack, J. Kiefer, A. Leipertz Concentration-dependent hydrogen-bonding effects on the dimethyl sulfoxide vibrational structure in the presence of water, methanol and ethanol ChemPhysChem 11, 630-637 (2010).

[95] K.J. Nogenmyr, J. Kiefer, Z.S. Li, X.S. Bai, M. Aldén Numerical computations and optical diagnostics of unsteady partially premixed methane/air flames Combustion and Flame 157, 915-924 (2010). (Journal’s Top 25 Hottest Articles January-March 2010)

[96] J. Kiefer, J.W. Tröger, T. Seeger, A. Leipertz, B. Li, Z.S. Li, M. Aldén Laser-induced breakdown spectroscopy in gases using ungated detection in combination with polarization filtering and online background correction Measurement Science and Technology 21, 065303, 7 pp (2010).

[97] J. Kiefer Dual-wavelength Raman spectroscopy approach for studying fluid-phase equilibria using a single laser Applied Spectroscopy 64, 687-689 (2010).

[98] T. Seeger, J. Kiefer, Y. Gao, C.J. Kliewer, B.D. Patterson, T.B. Settersten Suppression of Raman-resonant interferences in rotational CARS using time-delayed picosecond probe pulses Optics Letters 35, 2040-2042 (2010). (selected for the Virtual Journal of Laser)

[99] J. Kiefer, C.C. Pye Structure of the room-temperature ionic liquid 1-hexyl-3-methylimidazolium hydrogen sulfate: Conformational isomerism Journal of Physical Chemistry A 114, 6713-6720 (2010). (Journal’s Top 20 most read articles June 2010)

[100] K. Noack, P.S. Schulz, N. Paape, J. Kiefer, P. Wasserscheid, A. Leipertz The role of the C2 position in interionic interactions of imidazolium based ionic liquids: a vibrational and NMR spectroscopic study Physical Chemistry Chemical Physics 12, 14153-14161 (2010). (>100 citations)

[101] S. Schorsch, J. Kiefer, A. Leipertz, Z.S. Li, M. Aldén Detection of flame radicals using light emitting diodes Applied Spectroscopy 64, 1330-1334 (2010).

[102] S.C. Eichmann, M. Weschta, J. Kiefer, T. Seeger, A. Leipertz Characterization of a fast gas analyzer based on Raman scattering for the analysis of synthesis gas Review of Scientific Instruments 81, 125104, 7 pp (2010).

[103] J. Kiefer, Z.S. Li, T. Seeger, A. Leipertz, M. Aldén Planar laser-induced fluorescence of HCO for instantaneous flame front imaging in hydrocarbon flames Proceedings of the Combustion Institute 32, 921-928 (2009).

[104] J. Kiefer, M.C. Weikl, T. Seeger, F. von Issendorff, F. Beyrau, A. Leipertz Non-intrusive gas-phase temperature measurements inside a porous burner using dual-pump CARS Proceedings of the Combustion Institute 32, 3123-3129 (2009).

[105] J. Kiefer, A. Leipertz Bestimmung des Diffusionskoeffizienten mittels Fließinjektionsanalyse Chemie Ingenieur Technik 81, 441-446 (2009).

[106] J. Kiefer, A. Meyerhoefer, T. Seeger, A. Leipertz, Z.S. Li, M. Aldén OH-thermometry using laser polarization spectroscopy and laser-induced fluorescence spectroscopy in the OH A-X (1,0) band Journal of Raman Spectroscopy 40, 828-835 (2009).

[107] J. Kiefer, K. Obert, J. Fries, A. Bösmann, P. Wasserscheid, A. Leipertz Determination of glucose and cellobiose dissolved in the ionic liquid 1-ethyl-3-methylimidazolium acetate by using Fourier transform infrared spectroscopy

Applied Spectroscopy 63, 1041-1049 (2009). (selected for the Virtual Journal for Biomedical Optics 4(11) 2009)

[108] N.R. Dhumal, H.J. Kim, J. Kiefer Molecular interactions in 1-ethyl-3-methylimidazolium acetate ion pair: A density functional study Journal of Physical Chemistry A 113, 10397-10404 (2009).

[109] T. Seeger, J. Kiefer, A. Leipertz, B.D. Patterson, C.J. Kliewer, T.B. Settersten Picosecond time-resolved pure-rotational coherent anti-Stokes Raman spectroscopy for N2 thermometry Optics Letters 34, 3755-3757 (2009). (selected for the Virtual Journal of Laser)

[110] J. Kiefer, D.N. Kozlov, T. Seeger, A. Leipertz Local fuel concentration measurements for mixture formation diagnostics using diffraction by laser-induced gratings in comparison to spontaneous Raman scattering Journal of Raman Spectroscopy 39, 711-721 (2008).

[111] J. Kiefer, K. Obert, A. Bösmann, T. Seeger, P. Wasserscheid, A. Leipertz Quantitative analysis of alpha-D-glucose in an ionic liquid using infrared spectroscopy ChemPhysChem 9, 1317-1322 (2008).

[112] J. Kiefer, T. Seeger, S. Steuer, S. Schorsch, M.C. Weikl, A. Leipertz Design and characterization of a Raman-scattering-based sensor system for temporally resolved gas analysis and its application in a gas turbine power plant Measurement Science and Technology 19, 085408, 9 pp (2008). (selected as “featured article” by Meas. Sci. Technol.; journal’s “most cited papers” collection June 2010)

[113] Z.W. Sun, J. Kiefer, Z.S. Li, B. Li, M. Aldén Four wave mixing with non-resonant pump and resonant probe for OH detection in flames Applied Physics B 92, 287-293 (2008). (selected for the Virtual Journal of Laser)

[114] J. Kiefer, Z.S. Li, J. Zetterberg, X.S. Bai, M. Aldén Investigation of local flame structures and statistics in partially premixed turbulent jet flames using simultaneous single-shot CH and OH planar laser-induced fluorescence imaging Combustion and Flame 154, 802-818 (2008). (Journal’s Top 10 Hottest Articles July-September 2008)

[115] J. Kiefer, K. Obert, S. Himmler, P.S. Schulz, P. Wasserscheid, A. Leipertz Infrared spectroscopy of a Wilkinson catalyst in a room-temperature ionic liquid ChemPhysChem 9, 2207-2213 (2008).

[116] D.N. Kozlov, M.C. Weikl, J. Kiefer, T. Seeger, A. Leipertz Two-photon stimulated Raman excitation of thermal laser-induced gratings in molecular gases using broadband radiation of a single laser Optics Express 16, 18379-18389 (2008). (selected for the Virtual Journal of Laser)

[117] J. Kiefer, Z.S. Li, J. Zetterberg, M. Linvin, M. Aldén Simultaneous laser-induced fluorescence and sub-Doppler polarization spectroscopy of the

CH radical Optics Communications 270, 347-352 (2007).

[118] Z.S. Li, J. Kiefer, J. Zetterberg, M. Linvin, A. Leipertz, X.S. Bai, M. Aldén Development of improved PLIF CH detection using an Alexandrite laser for single-shot investigation of turbulent and lean flames Proceedings of the Combustion Institute 31, 727-735 (2007).

[119] Z.S. Li, M. Linvin, J. Zetterberg, J. Kiefer, M. Aldén Mid-infrared polarization spectroscopy of C2H2: Non-intrusive spatial-resolved measurements of polyatomic hydrocarbon molecules for combustion diagnostics Proceedings of the Combustion Institute 31, 817-824 (2007).

[120] J. Kiefer, J. Fries, A. Leipertz Experimental vibrational study of imidazolium-based ionic liquids: Raman and infrared spectra of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide and 1-ethyl-3-methylimidazolium ethylsulfate Applied Spectroscopy 61, 1306-1311 (2007). (selected for the Virtual Journal for Biomedical Optics 3(1) 2008; >100 citations)

[121] A. Braeuer, F. Beyrau, M.C. Weikl, T. Seeger, J. Kiefer, A. Leipertz, A. Holzwarth, A. Soika Investigation of the combustion process in an auxiliary heating system using dual-pump CARS Journal of Raman Spectroscopy 37, 633-640 (2006).

[122] M.C. Weikl, F. Beyrau, J. Kiefer, T. Seeger, A. Leipertz Combined coherent anti-Stokes Raman spectroscopy and linear Raman spectroscopy for simultaneous temperature and multiple species measurements Optics Letters 31, 1908-1910 (2006).

[123] T. Seeger, J. Kiefer, M.C. Weikl, A. Leipertz, D.N. Kozlov Time-resolved measurement of the local equivalence ratio in a gaseous propane injection process using laser-induced gratings Optics Express 14, 12994-13000 (2006).

Book chapters, Monographs, Book reviews

[124] J. Kiefer, S. Corsetti Raman and infrared spectroscopy of crude oil and its constituents in A.K. Shukla (ed.) “Analytical Characterization of Crude Oil and Related Products” Wiley Blackwell, 245-270 (2018).

[125] J. Kiefer Optics for Engineers, Charles A. DiMarzio. CRC Press (Taylor & Francis Group), Boca Raton, FL 2012. 535+xxii pp., £57.99, $89.95. ISBN: 978-1-4398-0725-5 Optics and Lasers in Engineering 50, 1185 (2012). (invited book review)

[126] J. Kiefer Industrial applications of laser diagnostics, Yoshihiro Deguchi. CRC Press (Taylor & Francis group), Boca Raton, FL (2012). 280+xvi pp., £89.00, $139.95. ISBN: 978-1-4398-5337-5 Optics and Lasers in Engineering 50, 1351 (2012). (invited book review)

[127] J. Kiefer Vibrational spectroscopy for studying hydrogen bonding in imidazolium ionic liquids and their mixtures with co-solvents in: K.-L. Han, G.-J. Zhao (Eds.) Excited-state hydrogen bonding and hydrogen transfer, Volume I, Chapter 16, 341-352, John Wiley & Sons (2011). (invited book chapter)

[128] J. Kiefer Introduction to Quantum Optics: Photon and Biphoton Physics (Series in Optics and Optoelectronics), Yanhua Shih. CRC Press (Taylor & Francis Group), Boca Raton, FL (2011). 464+xix pp., £38.99, $69.95. ISBN: 978-0-7503-0887-8 Optics and Lasers in Engineering 49, 1093 (2011). (invited book review)

[129] A. Leipertz, A. Braeuer, J. Kiefer, A. Dreizler, C. Heeger Laser-induced fluorescence in: M. Lackner, F. Winter, A.K. Agarwal (Eds.) Handbook of Combustion Vol. 2: Combustion Diagnostics and Pollutants Wiley-VCH, Weinheim, Chapter 8, 219-242 (2010). (invited book chapter)

[130] A. Leipertz, J. Kiefer Soot and soot diagnostics by laser-induced incandescence in: M. Lackner, F. Winter, A.K. Agarwal (Eds.) Handbook of Combustion Vol. 2: Combustion Diagnostics and Pollutants Wiley-VCH, Weinheim, Chapter 15, 403-423 (2010). (invited book chapter)

[131] J. Kiefer Nichtlineare optische Spektroskopie zur Diagnostik von Verbrennungsvorgängen Dissertation, Universität Erlangen-Nürnberg, Erlangen 2008. BEV Heft 8.3, ESYTEC GmbH, Erlangen (2008).

Further publications (selection)

[132] H. Müller, J. Kiefer FUELS | Gaseous Encyclopedia of Analytical Sciences, 3rd edition, Elsevier, 2017.

[133] J. Kiefer Polarization-resolved Raman spectroscopy for pharmaceutical applications American Pharmaceutical Review 20, 130-132 (2017). (invited article)

[134] J. Kiefer Powder analysis by solvent infrared spectroscopy (SIRS) American Pharmaceutical Review 20, 62-64 (2017). (invited article)

[135] S. Hemdal, D. Sedarsky, J. Kiefer, J. Moger Development and application of nonlinear optical spectroscopy: 15th ECONOS/35th ECW meeting in Gothenburg (Sweden) Journal of Raman Spectroscopy 48, 1019 (2017). (editorial)

[136] A.D. Flügel, J. Kiefer, A. Leipertz A method to estimate the optical path and the soot volume fraction in flames Digital Proceedings of the 8th European Combustion Meeting, 439-444 (2017).

[137] J. Kiefer Doing the splits: Raman Spectroscopy with broadband light sources American Pharmaceutical Review 19, 140-141 (2016). (invited article)

[138] J. Hofkens, M. Roeffaers, J. Kiefer, J. Moger Development and application of nonlinear optical spectroscopy: 14th ECONOS/34th ECW meeting in Leuven (Belgium) Journal of Raman Spectroscopy 47, 1109-1110 (2016). (editorial)

[139] J. Kiefer Enantioselective Raman Spectroscopy – A new tool for process monitoring in the pharmaceutical industry? American Pharmaceutical Review 19, 52-54 (2016). (invited article)

[140] J. Kiefer, J. Moger Development and application of nonlinear optical spectroscopy: 13th ECONOS/33rd ECW meeting in Dole (France) Journal of Raman Spectroscopy 46, 677-678 (2015). (editorial)

[141] J. Kiefer, K. Noack, A. Leipertz Background suppression for Raman analysis of pharmaceutically active compounds in fluorescing media American Pharmaceutical Review 16, 32-35 (2013). (invited article)

[142] J. Kiefer, P.P. Radi Development and application of nonlinear optical spectroscopy: the joint 11th ECONOS and 31st ECW meeting in Aberdeen, Scotland Journal of Raman Spectroscopy 44, 1317-1318 (2013). (editorial)

[143] A. Allen, D. Hendry, J. Kiefer, R. Neilson, A. Rodger, S. Sririmula, A. Starkey, C.H.-T. Wang Deep-water sensors: Developing technologies for meeting subsea environment safety challenges Marine Technology, April issue, 74-79 (2012). (invited article)

[144] T. Seeger, J. Kiefer, A. Leipertz Entwicklung eines laserbasierten Sensorsystems zur schnellen Gasanalyse GWF Gas/Erdgas 148, 548-552 (2007). (invited article)

Presentations (selection)

[1] “Fluid analysis by laser-induced gratings in the mid- and near-infrared” European Conference On Nonlinear Optical Spectroscopy (ECONOS), Jena/Germany, 2017 (invited talk).

[2] “Gas-Phase and Combustion Diagnostics by Infrared Laser-Induced Grating Spectroscopy” Light, Energy and the Environment (OSA), Leipzig/Germany, 2016 (invited talk).

[3] “Raman spectroscopy with broadband light sources” SciX – The Great SCIentific eXchange, Minneapolis/USA, 2016 (invited talk).

[4] “Raman spectroscopy for enantioselective analysis of chiral systems” SciX – The Great SCIentific eXchange (formerly the Annual Meeting of the Federation of Analytical Chemistry and Spectroscopy Societies, FACSS), Providence/USA, 2015 (invited talk).

[5] “Molecular structure and interactions in imidazolium ionic liquids: An experimental viewpoint” Department of Chemistry, Carnegie Mellon University Pittsburgh, Pittsburgh/USA, 2014 (invited seminar).

[6] “Combustion diagnostics using laser-induced breakdown techniques” Windows On Science Workshop on Advanced Laser Combustion Diagnostics, Wright-Patterson Air Force Base, Dayton/USA, 2014 (invited talk).

[7] “Visualisation of Reaction Intermediates in Combustion” German Symposium on Thermodynamics, Hamburg/Germany 2013 (plenary lecture).

[8] “Optical Methods for Bridging the Gap between Fundamental Science and Engineering” 100th Indian Science Congress, Kolkata/India 2013 (invited lecture).

[9] “Raman Spectroscopy for Monitoring the Production of Pharmaceutically Active Compounds in a Bioreactor” SciX – The Great SCIentific eXchange (formerly the Annual Meeting of the Federation of Analytical Chemistry and Spectroscopy Societies, FACSS), Kansas City/USA, 2012 (invited talk).

[10] “Laser-induced breakdown spectroscopy: A versatile tool for diagnostics of reactive flows” Laser Applications to Chemical, Security and Environmental Analysis (LACSEA), San Diego/USA, 2012 (invited talk).

[11] „Moderne optische Verfahren für die Verbrennungsdiagnostik“ Department Maschinenbau, Universität Siegen, and VDI-Bezirksverein Siegen, Arbeitskreis Energietechnik, Siegen/Germany, May 2011 (invited seminar).

[12] “Innovative approaches for the detection of flame generated species” Institute for Infrastructure and Environment, University of Edinburgh, Edinburgh/Scotland, March 2011 (invited seminar).

[13] “Application of Fourier transformation in spectroscopy” Metropolitan State College of Denver, Denver/Colorado/USA, April 2011 (invited lecture).

[14] “Cells under pressure: What can we learn from optical spectroscopy?” Magdalen College School, Oxford/England, November 2010 (invited lecture).

[15] “Interionic interactions in room-temperature ionic liquids: when vibrational spectroscopy meets quantum chemistry” Department Atomic and Laser Physics, University of Oxford, Oxford/UK, May 2010 (invited seminar).