Applications of the VUV Synchrotron SOLEIL St Aubin SOLEIL : 29 beamlines Valence-shell excitations in the gas and condensed phase DESIRS : Scientific case in the VUV (5-40 eV) 1.High resolution spectroscopy Ex : CO,CO 2, N 2, H 2, HD, D 2, He, C 2 H 4, C 2 H 2 etc (11) 2.Spectroscopy, fragmentation and reactivity of state-selected ions Radicals : C n H y, C n F y, carbenes, benzyl(9) Astro/combustion interest : PAHs, Diamondoids, ices(4) Pre-biotics/bio-mimetics : polynes, 2-pyridone, amino-acids, DNA basis, acetamide(7) Reactivity (CERISES ) : O + +CH 4, C x H y N z ++ + CH 4 (6) 2 : Mass spectrometry with ion traps Ex : Biopolymers (proteins, peptides, DNA sequences), organics molecules, atomic ions (9) 2 : Atmospheric chemistry SOA analysis by thermodesorption (1) 3.Photoionization dynamics Laser-excited species (1), autoionizing states (1) Nanoparticles & Clusters (Ar)(3) 4.Alignment, dichroism and chirality Gas phase ionization of chiral species (PECD) : organic species, amino-acids(8) CDAD/MFPADs on fixed-in-space molecules : Di-at, Tri-at, chiral molec(3) Condensed phase photochemistry on amino-acids : Leucine, Iso-valine, ices analogue (6) (homochirality of life) 5.Excitation and relaxation in the condensed phase Luminescent Solids (SiO 2 ) (4) Molecular Liquids (H 2 O, CH 3 OH) (2) 5 : Optical properties of bulk materials and thin films with the FTS (1) Outline The VUV FTS branch on the DESIRS beamline A wavefont division interferometer for a VUV FTS A multipurpose gas sample chamber VUV photoabsorption in a discharge cell Conclusion & Perspectives. The FTS Branch on the DESIRS Beamline Gas sample chamber VUV FTS Nahon, L. et al. (2012). J. Synchrotron Radiat. 19, 508520. Principle for a scanning WD interferometer fixed reflector mirror BS Mobile reflector HeNe VUV Source VUV photodiode HeNe beamsplitter mobile reflector mirror VUV source Main specs Spectral range : nm ( nm in exotic polarization) Undulator bandwidth : = 6% The p parameter can be changed in-situ ( 7