sr excited x-ray fluorescence analysis (srxrf)cheiron2007.spring8.or.jp/pdf/iida.pdf ·...
TRANSCRIPT
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SR excited X-ray Fluorescence Analysis
(SRXRF)
•Principles of SRXRF
•Micro-beam Analysis
•Applications of SRXRF
•Principles of SRXRF
•Micro-beam Analysis
•Applications of SRXRF
17 Sept., 2007Cheiron School
Atsuo IIDAPhoton Factory
XRF SRXRFSRXRF
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XRF PrimerXRF PrimerCheiron School 2007 by AOFSRR
A.Iida (PF)
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Ti
Excitation sources Analytical techniques
X-rays XRF (X-ray fluorescence analysis)
Electron EPMA (Electron probe micro analyzer)
Charged particle
PIXE (Particle/Proton Induced X-ray emission)
IncidentX-rays
photoelectron
KLM
N
KLM
NFluorescentX-rays
X-ray Fluorescence Analysis
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3MeV ProtonPIXE
Electron
PhotonXRF
after C.J.Spaks, JrIn “Synchrotron Radiation Research” (1980)
X-ray Emissionby Proton, Electron and Photon Excitation
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Energy Dispersive Mode vs. Wavelength Dispersive Mode
Energy Dispersive Mode
Wavelength Dispersive Mode
Advantage •High Efficiency•Multi-elemental detection
•High resolution•High S/B
•Low efficiencyDisadvantage •Low resolution•Scattering background
Ge / SDD
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SRXRF Pond Sediment (池底質)
Energy Dispersive Mode Fe 6%, Br 17ppm, Zn 343 ppm
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X-ray fluorescence intensity II
αωγ
γKK
K
Ki g1E ⋅⋅
−=
( ){ }α
μρλ
λλλsin
exp1)(d
⋅⋅⋅−−⋅⋅⋅=
⋅⋅
AAhCEqP
Iiiii
βμμ λλ
sinsin,, iss
αA +=
Total integrated fluorescence intensity by monochromatic excitation
Thick Specimen ( h => ∞)
αμ
λ λλsin
)(⋅
⋅⋅⋅=⋅
⋅ ACEqI
Uiiisi
Thin Specimen ( h => 0)
αμ
ρλ λλsin
)(Ui
iisi hCEqI⋅
⋅ ⋅⋅⋅⋅⋅=
Ci :Concentration h :Thickness
α β
λλ dI ⋅ ),( xdPi λ
ρ
xdx
λμ ,sis λμ ,
h
λμi : mass absorption coefficient of element i for incident X-ray energy of λ
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Sensitivity & Detection Limit (IUPAC)
Analytical calibration curve– The relation of the measured values (x) to the
concentration (c) (or any quantity(q)) of the material.– x=g(c) or x=g(q)
• Sensitivity S– the increment of the measured value Δx
for the unit change of the concentration Δc.
• Limit of detection / minimum detection limitcL (qL)
– the minimum concentration of the analyte element or minimum quantity which can be measured
bskxx bL ⋅+=
SbxLx
LC−
=
bxbS
k
Average value for the blankStandard deviation for the blank
Empirical value (=3)
c
x
dcdxS =
bxbsk ⋅Lx
LCdcdxS =
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MDL (Minimum detection limit)
Inte
nsi
ty (
Cts
)
Energy, Wavelength, Angle etc
NBNp
Minimum detectionlimit (MDL) k =
Bp
BNNNC
−3 Minimum quantification
limit (MQL) (2k ~3.3k)
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SR XRFSR XRFCheiron School 2007 by AOFSRR
A.Iida (PF)
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•Nondestructive •Multi-elemental analysis•Wide dynamic range
major ~ trace•High accuracy
•User-friendly instruments •Easy to analyze
Advantages of conventional XRF
SR
•High sensitivityng=>fg, ppm=>ppb
•Chemical state analysis
•Micro-beam analysismm => μm
•Total reflection analysis1015atoms/cm2
=> 108atoms/cm2
Advantages of SRXRF
Synchrotron radiation excited XRF-SRXRF-
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SR Properties and SRXRF
1) High Brilliance Source (small size and high collimation X-ray source)strong intensity (high density) =>signal enhancementhigh collimation =>micro beam analysis (focusing optics)
=>total reflection XRF
2) Linear polarization(p polarization + 90°arrangement) => background reduction
3) White (bending magnet), quasi-monochoromatic (Undulator) X-raysmonochoromatic X-rays => background reduction(monochromator) => selective excitation
(S/B optimization / Resolving overlapping peak)continuous energy scanning =>XAFS
(Chemical state analysis)4)High and low energy X-ray excitaiton
=>heavy & light trace elements analysis
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E
SSo
Φ
Storage Ring
e-
Φ∝ 2sinI
Background Suppression due to the linearly polarized SR
Monochromatic SR excitation
Laboratory source(2ndary target)
Monochromatic SR Excitation advantages:High Signal / Background ratio
(Sample: Chelete resin beads)
ContinuumSR excitation
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Selective Excitation :Resolving overalpping peaks: PbLα vs. As Kα Case
10 12 14 16
Fluorescent X-ray Energy (keV)
10 12 14 16Fluorescent X-ray Energy (keV)
X-r
ay In
tens
ity (a
.u.)
As K
α(1
0.5k
eV)
PbLα
(10.
5keV
)
PbLβ
(12.
6keV
)
Incident(14.6keV)
As K edge11.9 keV
Pb L3 edge13 keV
Incident(12.6keV)
As K
α(1
0.5k
eV)
As K
β(11
.8ke
V)
PbL3
edg
e
Ga
Kα
As Kedge < PbL3 edge <E0 As Kedge <E0< PbL3 edge
As K series alone is excited.=>As quantification becomes possible.
Both As K and Pb L are excited.
As K
edg
e
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Hard X-ray Advantage:Heavy elements analysis
• Disadvantage of L series analysis– Complicated lines Lα,β,γ,l,s– Peak overlapping between L and
K series lines
• Advantage of K series analysis– Simple line Structure Kα, Kβ– High sensitivity– Low absorption (bulk analysis)
High Energy 3rd generation ringWavelength shifter (Wiggler)
Na NdZrCa Hg FmZnP
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High Energy XRF
NIST SRM612 (50ppm)
I.Nakai, Y.Terada et al. SPring-8 BL08W => forensic science (differentiation of origins)
MDL:0.1ppm10pg
Eo=110keV
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Light Elements Analysis
•Light elements (C,N,O, Na~Ca)
-biological system /material science
•low fluorescence yield
•strong absorption
Chlorella (NIES CRM #3)
Soft X-ray Excitationfrom Undulator radiation
Excitation Efficiency is greatly enhanced.
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Wavelength Dispersive XRF
Wavelength Dispersive Energy DispersiveAdvantage •High resolution (ca. 5
eV~ 50eV eV)•High S/B
•High Efficiency•Multi-elemental detection
Disadvantage •Low efficiency •Low resolution (130 eV)•Scattering background
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Wavelength Dispersive Technique
Sample
AnalyzerCrystal(flat)
PSD Sample
AnalyzerCrystal(bent)
RowlandCircle
Detector
Sample
AnalyzerCrystal(flat)
SollerSlit
Multi-elemental geometry
θ-2θ geometry
DetectorBarrel type Crystalfor 2D focusing
Sample
Detector
Focusing geometry
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Wavelength Dispersive XRF Spectrum
Focusing geometryJohansson, R=5”LiF (200)
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Grazing Incidence Condition( High Brilliance Source )
• TXRF total reflection XRF– Ultra trace element analysis
• Depth analysis of a single thin layer or a multi-layer
• Reflectometry
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TXRF for Ultra Trace Element Analysis
0 2 40
0.5
1
101
102
103
104
105
12.3KeV Si
Ref
lect
ivity
Glancing angle (mrad)
Penetration depth(A)
SRDCM Sample
Total Reflection of X-raysat a flat and smooth surface(Si wafer, optical flat …..)
Extremely Shallow Penetration Depth
θc
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Total-Reflection X-ray fluorescence analysisUltra trace element analysis (TXRF)
TXRF Conventional
SubstrateSR
XRF
Si wafer
1015atoms/cm2=>108atoms/cm2
Impurity
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TXRF with Wavelength Dispersive Analyzer
WD-TXRF spectra for trace elements (Ni, Co and Fe, 20 ppbeach) in a micro drop (0.1 micro litter).
MDL 2~4fg107 atoms/cm2
@ SPring-8 BL40XUGe(220) Johansson focusing type WDXRF
K.SakuraiSPring-8 Informationvol.6 No.1(2001)p.35
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X-Ray Surface Analysis using GI Condition
Grazing Incidence condition
Diffraction/Scattering(GID/ GIS)
Spectroscopy
StructureAnalysis Reflectometry
Single Poly
XRFXRF XAFS XPS
TraceAnalysisTrace
AnalysisDepth
AnalysisDepth
Analysis
Grazing Exit conditionReciprocity
Theorem
GE-XRF
X-ray Standing Wave
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Chemical State Analysis
• XAFS (X-ray Absorption Fine Structure)– XANES
• Chemical shift of absorption edge• The intensity of the white line
– EXAFS• Local structure• Coordination number
• X-ray Emission– Chemical state analysis
• Chemical shift of the K or L emission lines• Intensity ratio of Kα and Kβ
– Emission Spectroscopy • Resonant inelastic emission spectroscopy• …..
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Incident X-rays
EXAFS (Extended X-ray Absorption Fine Structure)•Local structure•Coordination number
XANES(X-ray Absorption Near Edge Structure)•Electronic state•Chemical state
Sample:Crystal / amorphous materials
Incident X-rays
Transmitted X-rays
Fluorescent X-raysSecondary electrons
K
V
CIncident X-rays
XAFS (X-ray Absorption Fine Structure)
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Chemical State analysis by XANES-Chemical Shift of X-ray Absorption edge-
K.Sakurai (NIMS)
FingerprintMethod
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Pre-edge energy analysis:Oxidation state analysis of transition elements
A linear relationship between pre-edge peak energy and iron oxidation state for oxide and silicate standards.
=>chemical state analysis of transition element in mineral and in the functional materials
Fe XANES for magnetite
Fe2Si O4
Fe3 O4
Fe2 O3
Determination Fe3+/SFe ratio by the energy shift of a pre-edge in XANES S.Bajt et al. Geochim. Cosmochim. Acta58(’94)5209
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MicroMicro--SR XRFSR XRFCheiron School 2007 by AOFSRR
A.Iida (PF)
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X-ray source and X-ray microbeam
Source
Focusing Optics Focus
Low emittance source
Helmhortz invariant
y x u = y’ x u’
y,y’ source and focus size
u,u’ divergence and convergence angle
Low emittance source => small y x u
1/a + 1/b =1/f M=b/a
Small source size and low divergence ( 3rd generation ring) ⇒Smaller focus with higher intensity⇒micro-beam to nano-beam
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X-ray Focusing Elements
Reflection Grazing incidence mirrorNo chromatic spherical / asphericalaberration toroidal (bent cylinder)
elliptical, ellipsoidalparabolic, paraboloidal
Capillary (single, poly)
Diffraction Fresnel Zone plateEnergy Bragg-Fresnel lensdependence Crystal (asymmetric reflection / bent crystal)
Refraction Compound refractive lens
Reflection Grazing incidence mirrorNo chromatic spherical / asphericalaberration toroidal (bent cylinder)
elliptical, ellipsoidalparabolic, paraboloidal
Capillary (single, poly)
Diffraction Fresnel Zone plateEnergy Bragg-Fresnel lensdependence Crystal (asymmetric reflection / bent crystal)
Refraction Compound refractive lens
n = 1 - δ - iβ δ ~ 10-5
X-rays: electromagnetic wave with short wavelength
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Kirkpatrick-Baez opticsEllipsoidal
Single tapered capillary
Fresnel zone optics
Bragg-Fresnel
Compound refractive optics
X-ray microbeam Optics
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Fresnel Zone Plate Parameters
Δr: outermost zone widthN: total number of zonesD: lens diameterDOF: Depth of FocusΔλ/λ: maximum spectral bandwidth
After D.Attwood “SX & EUV Radiation”
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Grazing Incidence OpticsX-ray reflectivity for SiO2 substrate
Glancing angle dependence for 8 keV X-rays(θc=3.8 mrad).
Energy dependence for the galncing angle of 2.3 mrad(Εc=13 keV).
For reflectivity calculation, visit(CXRO) http://henke.lbl.gov/optical_constants/
θc Εc
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AberrationAstigmatismSpherical aberrationComaChromatic aberration
EX. Spherical mirror 1 / u + 1 / v = 1 / fmeridian focal length fm = R sinθi / 2sagittal focal length fs = R / 2 sinθi => fm / fs = θi
2
Astigmatismfs >> fmRs=Rmsin2θi toroidal mirror(bent cylinder)
Kirkpatrick-Baez opticsSpherical aberration
elliptical / ellipsoidal mirror
Aberration of Grazing Incidence Mirror
fm
fsAstigmatism
s
Spherical aberration
K-B optics
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Elliptical Mirror technology
ESRF Flexture Hinge
XradiaKB-SR1
APS Leaf spring
APS GeoSoilEnvironCARS
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Ultra High precision KB mirror48 x 36nm(VxH)
Elastic Emission Machining +
Chemical Vaporization Machining
By Osaka.U & SPring-8
S.Matsuyama et al. RSI 77(2006)093107
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Single Conical Capillary
After P.Engstrom
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Hard x-ray nanoprobe based on refractive x-ray lenses
C.G.Schroer et al APL 87(’05)124103 @ ESRF ID13
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X-ray Fluorescence imaging of single cells
a freeze-dried cancer cell treated with 5 µM of iodo-deoxydoxorubicin(anti-cancer drug).
14 keV polychromatic pink excitationCRL 60 x 60 μm2, μg/cm2
K Fe I
S.Bohic et al. APL 78(’01)3544
~1% 76 ppm 580 ppm
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Human Hair AnalysisSynchrotron X-ray Microprobe
Optical micrograph
S Ca Fe
Cu Zn
51 x 51 step3μm/step
Cross section of hair shaft, 20mm from root end
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SRXRF PerspectiveSRXRF PerspectiveCheiron School 2007 by AOFSRR
A.Iida (PF)
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SRXRF perspective
Microbeam analysis Toward 10nm microbeamAnalytical SR microprobeNovel Application
XRF imagingMicro-beamProjection typeMicro-CT
Wavelength DispersiveSpectroscopy =>Spectrometry
(RIXS, MCD ….)
Total reflection XRF108 atoms/cm2 =>106 atoms/cm2
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Chemical StateLocal Structure
μ-XAFSX-ray Emission
Crystal Structure
μ –XRDPoly- & Single crystal
Morphology Imaging (absorption, fluorescence, phase)
+
Analytical SR Microprobe- Multi-detection SR microprobe -
μ-SRXRF
SRXRF perspective
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Analytical SR MicroprobeCenter for nanoscale materials @APS
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SR Microprobe ESRF ID22
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SRXRF Imaging
μ-beam ScanningProjection3-dimensional (lateral + depth)Computed Tomograph
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Full-Field X-ray Fluorescence Imaging Microscopewith a Wolter Mirror (1)
M.Hoshino et al. 9th SRI AIP Conference Proceedings 879(2007) 1283
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Full-Field X-ray Fluorescence Imaging Microscopewith a Wolter Mirror (2)
(a) X-ray fluorescence image of an alfalfa seed. Exp: 5 m×12 integration. Bar: 0.5 mm. (CCD-2).
X-rayfluorescence energy spectra measured at (b) the luminous point and (c) the embryo. Exp: 100 s.
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Quick Projection-type XRF imaging (1)
Grazing incidence:Large area imaging
Collimator:Selection of Parallel beam
Elemental sensitivity :Scanning the excitation energy of incident X-rays
K.Sakurai, H.Eba: Anal. Chem., 75, 355 (2003).
Advantages•Large area (~cm2)•Quick(0.1s)•Medium spatial resolution(<20μm)
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Quick Projection-type XRF imaging (2)
Electrodeposition from the mixed electrolyte of 0.25 mol/L CuSO4 and 0.18 mol/L ZnSO4 with 2.5 V applied voltage. Exposure time for each image is 1 min and image size is 12 × 12 mm2.
9.3 keV
9.8 keV
Cu Image
Cu + Zn Image
Electrolysis cell
Dendrite growth during electrodeposition
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Confocal μ-XRF- depth profiling / 3D analysis -
A micro-volume is defined by the overlap of the foci of both X-ray optics.Incident beam focusing can be achieved by•Poly capillary•Monocapillary•CRL(refractive lens)•… Hasylab, Bessy II, CHESS..
Z.Smit et al. Nucl. Instr. Methods B219-220 (’04)35
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μ-XRF depth profiling of a Mughal miniature (paint multilayer on paper)
a Mughal miniature MIK I 5004 (10) “AbdallahZakhmi” of doubtful origin (stylistically dated to the 17th century).
B.Kanngiesser et al. Nucl. Instr. Methods B211(’03)259
a classical Mughal miniature MIK I 5004 (3) dated from the 18th century.
HgS / 2PbCO3・Pb(OH)2 / paper
BESSY II
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biology / medical
Material science
Methods
Archeology /Cultural Heritage
Geoscience
Others
SRXRF related Research Fields
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Environmental ScienceEnvironmental ScienceStardust ProjectStardust Project
Archeology/cultural HeritageArcheology/cultural HeritageCheiron School 2007 by AOFSRR
A.Iida (PF)
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SRXRF Applications to Environmental Science
• Phytoremediation• Aerosol Particles in Urban area• Waste fly ash• Uranium fuel from Chernobyl
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Arsenic hyper accumulator I
The Chinese Ladder fern (Pteris vittata), is a highly efficient accumulator of arsenic(up to 2%).L.Q.Ma et al. Nature 409(’01) 579
μ-XRF reveals the accumulation of As in leaf (pinna)
I.Nakai et al. J.Anal.Atom.Spect.(2006)
Where is a hyperaccumulated element stored ?What is the mechanism of the hyper accumulation.
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2-D X-ray Fluorescence Imaging of Cadmium Hyperaccumulating Plants
XRF imaging of a trichome taken from a leaf of the Cd hyper accumulating plant (Arabidopsis halleri ssp. Gemmifera).X-ray beam size, 3x3 μm2; scan step, 3 μm;measurement time, 0.5 s/pixel; image size, 59 x 226 pixels. Cd absorption edge : 26.7 keVA.Hokura et al. Chem. Lett. 35(’06)1246 SPring-8 Bl37XU
SEM image
Cd Zn Sr Ca
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Particulate Matter (Aerosol)
Effect
• Health effects– Asthma, Lung cancer,
Cardiovascular issues, and Premature death.
– Depnding on the size of the particle
• PM10: lungs, PM2.5, tend to penetrate into the gas-exchange regions of the lung, particles smaller than 100 nm: cell membranes
• Radiative forcing(Global warming)
“the uncertainties relating to aerosol radiative forcings remain large.” IPCC
Most Polluted World Cities by PM
Particulate matter,μg/m3 (2004) City
169 Cairo, Egypt
150 Delhi, India
128 Kolkata, India (Calcutta)
125 Taiyuan, China
123 Chongqing, China
109 Kanpur, India
109 Lucknow, India
104 Jakarta, Indonesia
101 Shenyang, China
The most of them are densely populated metropolitan areas in developing countries (Wikipedia).
The primary causethe burning of fossil fuels by transportation and industrial sources.
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Waste fly ash
μ-XRF μ-XRD
μ-XANES
XAS Image
Multi-technique X-ray microprobe
@ ESRF ID22KB E<18keVCRL E>15keV
SRN 16(’03)No.3, p.40
Fly ash contains potentially toxic trace metals (Pb, Ni, Cu, Cd) in concentrated amounts
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The origin of individual PM2.5 particles in Shanghai air
X.Li et al. NIM B260 (2007) 336
PM 2.5 refers to tiny particles or droplets in the air that are 2.5 μm or less.
Fine particles PM2.5 lead to health effectsand are a major cause of visibility impairment in the urban area contributing to acid rain.
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X-ray microscopy for characterisation of fuel particles
B.Salub et al. NIM A 467(2001)1249
Uranium fuel from Chernobyl (1986)During the explosion (West)
UO2-cores with surrounding layer of reduced U with low weathering rates.
During the subsequent fire (North)UO2-core with surrounding layers of oxidised U2O5/U3O8 with high weathering ratesμ-CTWest North
SEM
μ-XANES
West:reduced U
μ-CTμ-XRDμ-XANES
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Stardust ProjectNASA’s Comet Sample Return Mission
The Stardust mission was launched into space in early February 1999. Its destination - Comet Wild 2; its mission, to capture cometarymaterials before returning to earth in 2006.
The capture of comet dust within aerogel
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Stardust Project (NASA)
Stardust track in Aerogel
X-ray CT and XRF@SPring-8
http://www.spring8.or.jp/ja/current_result/SPring8News/no_33
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As many as 80 researchers involved !
ALS,APS, NSLS, SSRL
+SPring-8, ESRF
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CI- and Fe-normalized mean composition
The mean elemental composition of this Wild 2 material is consistent with the CI meteorite composition, which is thought to represent the bulk composition of the solar system, for the elements Mg, Si, Mn, Fe, and Ni to 35%, and for Ca and Ti to 60%. The elements Cu, Zn, and Ga appear enriched in this Wild 2 material, which suggests that the CI meteorites may not represent the solar system composition for these moderately volatile minor elements.
Summary
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SR in Archeology and Cultural Heritage
34%
33%
9%
15%
9%
pigment,painting, parchment,textileceramic,glaze, glass
metal, corrosion
bone, teeth,hair
Materials studied
35%
43%
16%
3% 3%
XRF XRD
XAFS IR
SAXS
By Mark Pollard (Univ. Oxford) ‘05
SR techniques used
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Egyptian Chemicals (cosmetics)
Pb3(CO3)2(OH)2Hydrocerrusite
Cosmetic powders in 52 make-up containers@ the Louvre Museum
μ-XRF + μ-XRD @ESRF ID22
Phase structure determination using the Rietveld refinement
Origin of the materials(crystal structure + impurity pattern)
E.Dooryhee et al.Rad. Phys. Chem. 71(’04)863
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μ-XRF depth profiling of a Mughal miniature (paint multilayer on paper)
a Mughal miniature MIK I 5004 (10) “AbdallahZakhmi” of doubtful origin (stylistically dated to the 17th century).
B.Kanngiesser et al. Nucl. Instr. Methods B211(’03)259
a classical Mughal miniature MIK I 5004 (3) dated from the 18th century.
HgS / 2PbCO3・Pb(OH)2 / paper
BESSY II
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SRXRF perspective
Microbeam analysis Toward 10nm microbeamAnalytical SR microprobeNovel Application
XRF imagingMicro-beamProjection typeMicro-CT
Wavelength DispersiveSpectroscopy =>Spectrometry
(RIXS, MCD ….)
Total reflection XRF108 atoms/cm2 =>106 atoms/cm2
If you have any questions about SRXRF please contact:
Atsuo IIDAPhoton [email protected]