x-ray absorption spectroscopy2 references: x-ray absorption and x-ray emission spectroscopy : theory...
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X-ray absorption spectroscopy
USTV school on the characterization of glass structure,Grenoble, November 17-22, 2019
Institut Néel, CNRS/Université Grenoble Alpes
Yves Joly
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References:
X-Ray Absorption and X-ray Emission Spectroscopy : Theory and ApplicationsEdited by J. A. van Bokhoven and C. Lamberti, Wiley and sons (2016).ISBN : 978-1-118-84423-6.
and more specifically, chapter 4 :"Theory of X-ray Absorption Near Edge Structure" Yves Joly and Stéphane Grenier.
About X-ray Raman spectroscopy:"Full potential simulation of x-ray Raman scattering spectroscopy“Y. Joly, C. Cavallari, S. A. Guda, C. J. SahleJ. Chem. Theory Comput. 13, 2172-2177 (2017).
Soon International Tables for Crystallography, Volume I on XAS
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Outline
I – X-ray Matter interaction and absorption spectroscopy
II – Examples in XANES
III – X-ray Raman Scattering
A- Introduction
F – About ab initio simulation
B- Some properties
C – From multi-electronic to mono-electronic
D – Absorption cross section formula
E – Selection rules
G – EXAFS in Brief
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ħ, I0
ħ, I
ħ’, I’
ħF, IF
Transmission
Fluorescence
Electrons
A-Introduction
Elastic scattering Resonant x-ray scattering
Inelastic scattering X-ray Raman
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Monochromatic beam ħ, I
Absorption
Beer-Lambert law :
ln(I0/I) = D
n
1iiσV
1μ V : (cell) volume with n atoms
i = absorption cross section
For a solid :
cm2 or Mbarn 1 Mbarn = 10-18 cm2
I = I0exp(-D)
: total linear absorption coefficientD: sample thickness
homogeneousisotropicmaterial
I0
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6J.-L. Hazemann, O. Proux et al.CRG FAME, ESRF
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For any chemical element there is a set of absorption edges
K L2 M2
H 13.6
C 284.2
Fe 7112 720 52.7
Ag 25514 3524 604
U 115606 20948 5182
Some edges (eV)
Deeper is the edge
Shorter is the time life
Broader is the edge
n = 1
n = 2
n = 3
ℓ = 0
ℓ = 0
ℓ = 0ℓ = 1
ℓ = 2
ℓ = 1
Fermi
K
L1
L2
M2
L3
M1
M3M4
M5
spin-orbit spreads level between 2
Experiment Ch. Den Auwer et al.
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X-ray absorption spectra are a signature of the probed material
B – Some properties of X-ray absorption
Dependence on the local geometry
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Dependence on the polarization light
Pleochroism or dichroism is the change in color evident as the mineral is rotated under plane-polarized light.
Due to adsorption of particular wavelengths of light. transmitted light to appear colored.
Function of the thickness and the particular chemical and crystallographic nature of the mineral.
Also true in the X-ray energy range :
B. Poumellec et al., DCI-LURE
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Dependence on the oxidation state
SH
SO
=
SO O
Pichon et al. IFP, LURE
K+2 (SO4)
2-
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Circular polarization light and ferromagnetic materials
Measurements with circular polarization are sensitive to magnetic materials
XMCD = left - right
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Atom shell 1
Atom shell 2
Final states are calculated by simple interference between the outgoing wave and the backscattered waves by the different shells
EXAFS gives information on
- The number of atoms per shell,
- The distance of the shells
EXAFS and XANES
0
0.5
1
1.5
8900 9000 9100 9200 9300 9400
Seuil K du Cuivre dans Cu et YCuO2.5
Energie (eV)
Cuivre, métal
YCuO2.5
XANES
EXAFS
XANES gives information on
- 3D arrangement
- Local symmetry,
- Electronic and magnetic structure
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X-ray absorption spectroscopies are
- local spectroscopies
- Selective on the chemical specie
- Process involved are complex…
EF Absorption cross section
g
f
Core hole
Pertubated electronic structure
C – From multi-electronic to mono-electronic
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Characteristic times
1 – Time of the process « absorption of the photon »t1 = 1/Wfi, Wfi absorption probabilty
t1 < 10-20 s
2 – Time life of the core holet2 = ħ /Ei, Ei width of the level
for 1s for Z = 20 up to 30, Ei ≈ 1 eVt2 ≈ 10-15 à 10-16 s
3 – Relaxation time of the electronEffect on all the electrons of the field created by the hole and the
photoelectron. Many kinds of process, multielectronic.t3 ≈ 10-15 à 10-16 s
4 – Transit time of the photoelectron outward from the atomDepends on the photoelectron kinetic energy, for Ec = 1 à 100 eV
t4 ≈ 10-15 à 10-17 s
5 – Thermic vibrationt5 ≈ 10-13 à 10-14 s
multi-electronic process can be seen at low energy of the photoelectron
X-ray absorption takes a snap shot of the pertubated material
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Non localized final statesLocalized final states
EF Absorption cross section
g
Absorption cross section
EF
g
- Interaction with the hole mono-electronic approach
Ground state theory: DFT
spatialy
In energy
signal back quickly to 0
- Several possible electronic states…
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A. Scherz, PhD Thesis, Berlin
Non localized final statesLocalized final states
Ground-state theorymultiplet
O. Proux et al.FAME, ESRF
Intermediatesituation …
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Improvements in progress:Bethe Salpeter Equation (Shirley…)Time-Dependent DFT (Schwitalla…)Multiplet ligand field theory using Wannier orbitals (Haverkort…)Multichannel multiple scattering theory (Krüger and Natoli)Dynamic mean field theory (Sipr…)Quantum chemistry techniques, Configuration interaction…
Multiplet ligand field theory:multi-electronic but mono-atomic L23 edges of 3d elements M45 edges of rare earth
DFT:Multi-atomic but ground state theory (mono-electronic) K, L1 edges L23 edges of heavy elements
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Plane wave :
Interaction Hamiltonian:
𝑨 𝒓, 𝑡 𝐴 𝑎𝑒 𝒌.𝒓 𝜺 𝑎 𝑒 𝒌.𝒓 𝜺∗
𝑬 𝒓, 𝑡 𝑖𝜔𝐴 𝑎𝑒 𝒌.𝒓 𝜺 𝑎 𝑒 𝒌.𝒓 𝜺∗
𝑩 𝒓, 𝑡 𝑖𝐴 𝑎𝑒 𝒌.𝒓 𝒌 𝜺 𝑎 𝑒 𝒌.𝒓 𝒌 𝜺∗
𝐻𝑒𝑚 𝒑. 𝑨
𝒑 𝑖ℏmomentum
D – Absorption cross section formula
o
f
g
ℏ𝒌𝜺
Signal depends on :
- initial states g
- final states f
- a transition operator o
light polarisation light wave vector
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𝜎 𝜔 4𝜋 𝛼ℏ𝜔 𝐹 𝑜 𝐼 𝛿 ℏ𝜔 𝐸 𝐸
E1El. dipole
E2El. quadrupole
o
f
g
𝑃2𝜋ℏ 𝑓 𝑜 𝑔 𝛿 ℏ𝜔 𝐸 𝐸
𝑓 𝑜 𝑔 𝑓 𝒓 𝑜 𝒓 𝑔 𝒓 𝑑𝒓
Golden Rule : Dirac (1927) called by Fermi in 1950 Golden Rule n° 2
𝐹 and 𝐼: multi-electronic final and initial states
o 𝜺 · 𝒓 𝜺 · 𝒓𝒌 · 𝒓
Multi-electronic system Transition from 𝐼 to 𝐹
Absorption cross section formula
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Multielectronic:
Mono-electronic absorption cross section formula
𝜎 𝜔 4𝜋 𝛼ℏ𝜔𝑆 𝑓 𝑜 𝑔 𝛿 ℏ𝜔 𝐸 𝐸 ∆𝐸
𝜎 𝜔 4𝜋 𝛼ℏ𝜔 𝐹 𝑜 𝐼 𝛿 ℏ𝜔 𝐸 𝐸
Ground state (≈ mono-electronic) approximation:
Relaxation effect of the “other” electrons
o 𝜺 · 𝒓 𝜺 · 𝒓𝒌 · 𝒓
𝑓 is by default calculated in an excited state:- with a core-hole- an extra electron on the first non occupied level
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𝜎 𝜔 4𝜋 𝛼ℏ𝜔 𝑓 𝑜 𝑔 𝛿 ℏ𝜔 𝐸 𝐸
Core-hole and photoelectron time life effects
Lorentzian convolution
𝛤 𝛤 𝛤 𝐸
𝛤 : core-hole widthClassical experiment: known tabulated values
M. O. Krause, J. H. Oliver, J. Phys. Chem. Ref. Data 8, 329 (1979)
Experiment using High resolution fluorescence mode:Reduced value
𝛤 : photoelectron state widthDue to all possible inelastic processIncrease with energy
12𝜋
𝛤
𝐸 𝐸
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E – Selection rules
Inside the absorbing atom (non magnetic case) :Spherical harmonic
Solution of the radial Schrödinger equationAmplitudes. Contains the main
dependence on the energy. Contains theinformation on the density of state
𝑓 𝒓 𝑎ℓ 𝐸 𝑏ℓ 𝑟 𝑌ℓ 𝑟ℓ
K edge :
LII edge :
∣ , ⟩ 𝑔 𝑟 0𝑌 ∣ , ⟩ 𝑔 𝑟 𝑌
0
∣ , ⟩ 𝑔 𝑟𝑌
𝑌∣ , ⟩ 𝑔 𝑟
𝑌
𝑌
ℓ 0
ℓ 1
Core states g
Final states f
𝑓 𝑜 𝑔
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The expansion of 𝜺 · 𝒓 and 𝒌 · 𝒓 in real spherical harmonics gives :
For example, polarization along z, wave vector along x :
The transition matrix is then:
Radial integralGaunt coefficient
(tabulated constant related to the Clebch-Gordon coefficient)
non zero, only for some ℓ and m gives the
selection rules
Slowly varying with E
Strong dependence with ℓo
1o mo= 0
2o mo= 1
Transition operator o
𝜺 · 𝒓4𝜋3 r𝑌
𝜺 · 𝒓 𝑧 𝑟 cos 𝜃 𝑐 r𝑌
𝜺 · 𝒓 𝒌 · 𝒓 𝑘𝑧𝑥 𝑘𝑟 sin 𝜃 cos 𝜃 cos 𝜑 𝑐 𝑘𝑟 𝑌
𝑓 𝑜 𝑔 𝑐ℓ 𝑘ℓ 𝑎ℓ 𝐸ℓ
𝑏ℓ 𝑟, 𝐸 𝑔ℓ 𝑟 𝑟 ℓ 𝑑𝑟 𝑌ℓ∗𝑌ℓ 𝑌ℓ 𝑑 𝑟
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Angular integral non zero only for :
ℓ : same parity than ℓg + ℓo
|ℓg - ℓo| ≤ ℓ ≤ ℓg + ℓo
with complex spherical harmonics :
m = mo + mg
Dipole: ℓ = ± 1Quadrupole : ℓ = 0, ± 2
Dipole probed state
Quadrupole probed state
K, LI, MI, NI, OI p d
LII, LIII, MII, MIII, NII, NIII, OII, OIII
s - d p - f
MIV, MV, NIV, NV, OIV, OV
p - f s - d - g
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K edge case :
dipole component and polarization along z :
one probes the pz states projected onto the absorbing atom
quadrupole component, polarization along z, wave vector along x :
one probes the dxz states projected onto the absorbing atom
kB
e
z
x
XANES is very sensitive to the 3D environment
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EF
g
f
Fluorescence
Transmission
Electrons
Whatever is the detection mode,
- one measures the transition probability between an initial state g and a final state f
- Thus one measures the density of state
- The density of state depends on the electronic and geometric surrounding of the absorbing atom
𝜎 𝜔 4𝜋 𝛼ℏ𝜔 𝑓 𝑜 𝑔 𝛿 ℏ𝜔 𝐸 𝐸 ∝ ℛ𝒜 𝑎ℓℓ
𝜌 𝐸 𝑓 𝑓 4𝜋𝑟 𝑏ℓ 𝑑𝑟 𝑎ℓℓ
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F- About ab initio simulation
About the potential
As in most electronic structure calculations the choice of the potential is important
One body calculation = local density approximation (LSDA)
Potential = Coulomb potential + exchange-correlation potential
Depends just on the electron
density
Different theories
X
Hedin and Lundqvist
Perdew…..
Depends also on the electron kinetic energy
0
0,05
0,1
0,15
0,2
0,25
0 50 100 150 200
Energy (eV)
Example of calculation
Xanes spectra of the copper K-edge in copper fcc
X
Energy dependent Hedin and Lundqvist
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And about the shape of the potential
The muffin-tin approximation the MT of the LMTO program
(almost) always used in the multiple scattering theory
Constant between atoms
Spherical symmetry inside the atoms
Before approximation After approximation
Overlap
Empty sphere
With the muffin-tin, there are always 2 parameters : overlap and interstitial constant
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The multiple scattering theory
Two ways to explain it :
the Green function approach
the scattering wave approach
Just one atom :
We build a complete basis in the surrounding vacuum (Bessel and Hankel functions)
We look how the atom scatters all the Bessel functions (phase shift theory)
Atomic scattering amplitude
Bessel Outgoing Hankel
Photoelectron wave vectorAmplitude
Solution of the radial Schrödinger
equation
𝜑 𝒓 𝑎ℓ𝑏ℓ 𝑟 𝑌ℓ 𝑟 𝑗ℓ 𝑘𝑟 𝑖𝑡ℓ ℎℓ 𝑘𝑟 𝑌ℓ 𝑟
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Several atoms ( cluster )
Each atom receives not only the central Bessel function but also all the back scattered waves from all the other atoms
The problem is not anymore spherical
We have to fill a big matrix with the scattering atomic amplitudes of each atom and the propagation function from one atom to another
Matrix containing the atomic scattering amplitudesMatrix containing the
geometrical terms corresponding to the scattering from any site
“a” of the harmonic L=(ℓ,m) towards any site “b” with the
harmonic L’
𝜏1
1 𝑇𝐻 𝑇
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one gets for the absorption cross section:
Multiple scattering amplitude
Green’s function
From the optical theorem :
𝜎 𝜔 4𝜋 𝛼ℏ𝜔 ℐ 𝑔 𝑜∗ 𝑏ℓ𝑌ℓ 𝜏ℓℓ 𝑏ℓ 𝑌ℓ 𝑜 𝑔
ℓ ℓ
𝑎ℓ 𝑎ℓ∗ ℐ 𝜏ℓ
ℓ
𝜑 𝒓 𝑎ℓ 𝐸 𝑏ℓ 𝑟, 𝐸 𝑌ℓ 𝑟 χℓ
Wave function in the atom:
When no spin-orbit:
Then one gets the scattering amplitude of the central atom in the presence of its neighboring atoms.
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When considering only one scattering process : EXAFS
When considering a limited expansion of scattering processes : path expansion XANES without the first eV
When considering all the scattering processes : XANES including the edge
𝜏1
1 𝑇𝐻 𝑇
𝜏1
1 𝑇𝐻 𝑇 ≅ 𝑇 𝑇𝐻𝑇
𝜏1
1 𝑇𝐻 𝑇 ≅ 𝑇 𝑇𝐻𝑇 𝑇𝐻 𝑇 ⋯ 𝑇𝐻 𝑇
Different codes:- FeffFit- GNXAS
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Absorbing atom
The finite difference method
22
2 2h
xhxhxx
x ffff
Discretization of the Schrödinger equation on a grid of points
016,2,2
jjfifi h
EVh
𝜑 𝒓 𝑎ℓ 𝐸 𝑏ℓ 𝑟, 𝐸 𝑌ℓ 𝑟 χℓ
𝜑 𝒓 𝑗ℓ 𝑘𝑟 𝑌ℓ 𝑟 𝑖 𝑠ℓ 𝐸 ℎℓ 𝑘𝑟 𝑌ℓ 𝑟ℓ
Interest : free potential shapeDrawback : time consuming Use of MUMPS library (sparse matrix solver)
40 times faster low symmetry possibleS. Guda, et al. J. Chem. Theory Comput. 11, 4512 (2015)
+ continuity at area bordersBig matrix, unknowns: if ,
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Code for XANES using the mono-electronic approach (not complete)
C. R. Natoli(INFN, Frascati, Italy, 1980)
Cluster approach -Multiple scattering theory
Now with a fit by M. Benfatto
CONTINUUMThe first !
MXAN
J. Rehr,A. Ankudinov et al.(Washington. U., USA, 1994)
Cluster approach -Multiple scattering theory - path expansionfit – self consistency
FEFF feff.phys.washington.edu/feff/
T. Huhne, H. Ebert(München U., Germany)
Band structure approach – Full potential
SPRKKR olymp.cup.uni-muenchen.de/ak/ebert/SPRKKR/
P. Blaha et al.(Wien, Austria)
Band structure, FLAPW Wien-2k susi.theochem.tuwien.ac.at
Y. Joly, O. Bunau(CNRS, Grenoble)
Cluster approach, MST and FDM
FDMNES www.neel.cnrs.fr/fdmnes
K. Hermann, L. Pettersson(Berlin, Stockholm)
LCAO STOBE w3.rz-berlin.mpg.de/~hermann/StoBe/
D. Cabaret et al.(LMPC, Paris)
Band structure, Pseudo potential
Xspectra /Quantum-espresso
www-ext.impmc.jussieu.fr/~cabaret/xanes.html
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G. EXAFS in brief
A first order approximation
Absorbing atom part Backscattering by the neighboring atom
𝜎 𝐸 𝐾 𝑓 𝜺 · 𝒓 𝑔
𝑓 𝑓 𝛿𝑓
𝜎 𝐸 𝐾 𝑓 𝜺 · 𝒓 𝑔 2𝐾ℛ𝑒 𝛿𝑓 𝜺 · 𝒓 𝑔 𝑔 𝜺 · 𝒓 𝑓
𝛿𝑓
𝑓
𝜎 𝐸
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Inelastic mean free path
Thermal disorder
and Fourier transform fit of R, N and
Theory of phase shift:
𝜒 𝐸𝜎 𝜎
𝜎2ℛ𝑒 𝛿𝑓 𝜺 · 𝒓 𝑔 𝑔 𝜺 · 𝒓 𝑓
𝑓 𝜺 · 𝒓 𝑔
𝛿𝑓 𝑓 𝜋1
2𝑖𝑘 1 ℓ 2ℓ 1 𝑒 ℓ sin 𝛿ℓℓ
→Electron scattering amplitude
𝜒 𝑘𝑁
𝑘𝑅𝑒 𝑒 𝑓 𝜋 sin 2𝑘𝑅 2𝛿 𝛿
𝛿 𝛿
𝑘 ℏ 𝐸 𝐸
𝑘𝑅
𝑅
phase shifts
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Fourier transform
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Examples in XANES
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Linear dichroism in rutile TiO2
Rutile TiO2
0 10 20 30 40 50
A1A
2 A3
Full line : Calculation // z
perp. z
e
e
Dotted experiment
ke
(b)
k
e
(c)
z
xy
ke
(a)
dipolequadrupole
Important linear dichroism
Influence of the core-hole
Shift of the 3d
Experiment by Poumellec et al.
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3 4 5 6 7 8 9 10 11 12Energy (eV)
A1
A3A
2
d
dq
q
dz2
pz
By the dipole component which probes the pstates, we also observe the projection of the
d states of the neighboring Ti
With a precise analysis of the XANES features, we get a detailed description of the electronic
structure
Quantitative analysis of the pre-edge
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Organic molecule on surface : acrylonitrile
For the light element
- Long hole life time
- Good energy resolution
- Study of the first non occupied molecular orbitals
Normal
grazing
The molecules are deposited on a surfaceThe experiment is performed along 2 directions
Normal incidence, x-ray probe px and py orbitals, projections of the antibonding molecular orbitals y* and sGrazing incidence, x-ray probe pz orbitals, projections of the antibonding molecular orbitals z*
y
xN C
H
Scheme of acrylonitrile
py
y*
px
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Tourillon, Parent, Laffont (LURE)
XANES lets to determine how are arranged the molecules
Normal = ½cos(x+y)+sinz
z
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Iron in solution
Fe2+ Fe-O = 2.16 AFe3+ Fe-O = 2.06 A
No need of mixing Fe2+ - Fe3+
With Wang and Vaknin, Ames Laboratory
shoulder
Shift
Effect of second shell
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Pt13 cluster on -Al2O3 under H2
High resolution XANES+
DFT-Molecular dynamics(VASP)
+XANES simulation
Many parameters13 Pt positionsH numberH positions2 difference facesSome size dispersionSeveral site absorption…
A. Gorczyca et al., coll. IFPEN, Solaize, FranceJ.-L. Hazemann, O. Proux…
Exp: FAME / ESRF
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11560 11570 11580 115900,0
0,5
1,0
1,5
2,0
2,5
Nor
m. A
bs.
Energy (eV)
500°C, P(H2) = 10-5 bar
25 °C, P(H2) = 10-5 bar
500 °C, P(H2) = 1 bar
25 °C, P(H2) = 1 bar
P(H2) ↗ or T ↘:• ↘ intensity of white line• WL wider• Energy shift• ↗ post white line features
Experimental observations
45
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Pt13 / – alumina case
Area of calculationcontaining the Pt (H) clusterand substrate (distorted) atoms
L3 simulation in the ground state
1 calculation gives the 13 atomsabsorption spectra
MST
Set of atomistic modelsfrom DFT (VASP)
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11560 11580 11600 116200,0
0,5
1,0
1,5
2,0
2,5
3,0
3,5
Nor
m. A
bs.
Energy (eV)
18 H
Experimental spectrum25°C, P(H2) = 1bar
Spectra sensitivity on models
(100) face only
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11560 11580 11600 116200,0
0,5
1,0
1,5
2,0
2,5
3,0
3,5
Nor
m. A
bs.
Energy (eV)
48
0 H
18 H
Experimental spectrum25°C, P(H2) = 1bar
Spectra sensitivity on models
(100) face only
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49
11560 11580 11600 116200,0
0,5
1,0
1,5
2,0
2,5
3,0
3,5
Nor
m. A
bs.
Energy (eV)
18H
Experimental spectrum25°C, P(H2) = 1bar
20H
Sensitive tool for the quantificationof hydrogen coverage and morphology
(100) face only
Spectra sensitivity on models
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11560 11570 11580 115900
1
2
3
4
5
Nor
mal
ized
Abs
orpt
ion
(A. U
.)
Energy (eV) Pt13H18
25°C, P(H2) = 1bar
500°C, P(H2) = 1bar
25°C, P(H2) = 10-5 bar
500°C, P(H2) = 10-5 bar
Pt13H16
Pt13H4
Pt13H10
Pt13H20
Pt13H14
Pt13H8
Pt13H2
(100)(110)
Sim
Exp
Simulations vs experiments : Best fits
Identification of hydrogen coverage / morphology on eachsurface and for each experimental condition
Pt Al
O H
A. Gorczyca et al. Angew. Chem. Int. Ed., 53, 12426 (2014)50
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X-ray Raman Scattering
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X-ray Raman Scattering (XRS)
Inelastic scattering technique energy loss ≈ absorption edge energy
or Non Resonant X-ray Inelastic Scattering (or EELS on Trans. Elec. Micr.)
EF
g
f
𝒒 𝒌 𝒌2
𝜔 , 𝒌𝜔 , 𝒌ℏ𝜔
ℏ𝜔
ℏ𝜔 ℏ𝜔 ℏ𝜔 𝐸 𝐸
First experiments by Suzuki et al. (end of 60th)
Main interest access to low energy edges using hard X-rayin situ, operando, extreme conditions…
Drawback low signal
But new synchrotron generation, new spectrometers new XRS beamlines
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First approximation :
Same than (dipole) XANES, with q
𝑆 𝒒, 𝜔 𝑓 𝑒 𝒒.𝒓 𝑔 𝛿 ħ𝜔 𝐸 𝐸,
𝑑 𝜎𝑑𝛺 𝑑ℏ𝜔 𝑟
𝜔𝜔 𝜀 . 𝜀 𝑆 𝒒, 𝜔
𝑓 𝑒 𝒒.𝒓 𝑔 ≅ 𝑓 1 𝑖𝒒. 𝒓 𝑔 ≅ 𝑓 𝒒. 𝒓 𝑔
Dynamic structure factor:
Cross section:
Exact expansion:
Bessel function
𝑒 𝒒.𝒓 4𝜋 𝑖 ℓ𝑗ℓ 𝑞𝑟ℓ
𝑌ℓ∗ 𝑟 𝑌ℓ 𝑞
The formula
𝑞𝒒𝑞
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Monopoleℓ = 0
Dipoleℓ = ±1
Dependence on q (scat. angle)
Probe of the different ℓ
sin 𝑞𝑟𝑞𝑟
cos 𝑞𝑟𝑞𝑟
sin 𝑞𝑟𝑞𝑟
1
𝑆 𝒒, 𝜔 𝑓 𝑗 𝑞𝑟 4𝜋𝑖𝑗 𝑞𝑟 ∑ 𝑌 ∗ 𝑟 𝑌 𝑞 ⋯ 𝑔 𝛿 ħ𝜔 𝐸 𝐸,
𝑌ℓ∗ 𝑟 𝑌ℓ
∗ 𝑟 𝑌ℓ 𝑟 𝑑𝑟 0
selection rule from:
Disordered material case (powder, glasses)
𝑆 𝑞, 𝜔 𝑓 𝑗 𝑞𝑟 𝑔 4𝜋 𝑓 𝑗 𝑞𝑟 𝑌 ∗ 𝑟 𝑔 ⋯,
𝛿 ħ𝜔 𝐸 𝐸
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ExpID20, ESRF
CubicF𝑚3𝑚
Pt. group𝑚3𝑚
SCFR = 8 Å
ExamplesF edge in LiF
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Sp. groupP63/mmc
Pt. group6m2
SCFR = 8 Å (B)R = 10 Å (N)
h-BN
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57Y. Joly, C. Cavallari, S. A. Guda, and C. J. Sahle, J. Chem. Theory Comput. 13, 2172-2177 (2017).DOI: 10.1021/acs.jctc.7b00203
𝑝 𝑠𝑝 𝑝 𝑠𝑝
3-fold axis along c 𝑠𝑝 in basal plane
m plane no 𝑝 𝑠 hybridization
3.33 Å
1.45 Å
Anti-bondingB𝑠𝑝 N𝑠𝑝
B𝑝 N𝑝
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Thèse Emmanuelle de Clermont Gallerande (IMPMC)
Etude de la structure locale d’Alcalin par XRS
Effect of non-bridging Oxygen
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Comparison glass-Crystal
xNa2O-(1-x)B2O3
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Tutorial on FDMNES
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The FDMNES code1995: ESRF at Grenoble + Denis Raoux + Rino Natoli
Starting of the XANES theoretical study
1996: first version of FDMNESXANES calculation beyond the muffin-tin approximationXAFS IX, Grenoble, 26-30 Août 1996
1999: Resonant diffraction
2000–2009: Multiple Scattering TheoryMagnetism - Spin-orbitSpace group symmetry analysisTensor analysisFit procedureSelf-consistency
2010-2018: LDA + U, TD-DFTXES (valence to core)X-ray RamanSurface resonant X-ray Diffraction
COOP
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fdmfile.txt VO6_inp.txt
fdmnes
VO6_out.txt
VO6_out_conv.txt
VO6_out_bav.txt
VO6_out_sd0.txt
fdmnes_error.txt
Same directory
VO6_out_scan.txt VO6_out_atom1.txt
VO6_out_sph_atom1.txt VO6_out_sph_xtal.txt
Input and output files
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FiloutSim/VO6
Range-2. 0.1 0. 0.5 60.
Radius 2.5
Quadrupole
Polarization
Molecule2.16 2.16 2.16 90. 90. 90. 23 0.0 0.0 0.0 8 1.0 0.0 0.0 8 -1.0 0.0 0.0 8 0.0 1.0 0.0 8 0.0 -1.0 0.0 8 0.0 0.0 1.0 8 0.0 0.0 -1.0
Convolution
End
63
Examples of FDMNES indata file FiloutSim/Fe3O4
Range-2. 0.1 -2. 0.5 20. 1. 100.
Radius5.0
GreenQuadrupole
DAFS0 0 2 1 1 45.0 0 6 1 1 45.4 4 4 1 1 0.
SpgroupFd-3m:1
Crystal8.3940 8.3940 8.3940 90 90 90
26 0.6250 0.6250 0.6250 ! Fe 16d 26 0.0000 0.0000 0.0000 ! Fe 8a8 0.3800 0.3800 0.3800 ! O 32e
Convolution
End
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FiloutSim/VO6
Range-2. 0.1 0. 0.5 60.
Radius 2.5
Quadrupole
Polarization
Molecule2.16 2.16 2.16 90. 90. 90. 23 0.0 0.0 0.0 8 1.0 0.0 0.0 8 -1.0 0.0 0.0 8 0.0 1.0 0.0 8 0.0 -1.0 0.0 8 0.0 0.0 1.0 8 0.0 0.0 -1.0
Convolution
End
64
Examples of FDMNES indata file FiloutSim/Fe3O4
Range-2. 0.1 -2. 0.5 20. 1. 100.
Radius5.0
GreenQuadrupole
DAFS0 0 2 1 1 45.0 0 6 1 1 45.4 4 4 1 1 0.
Cif_fileSim/in/Fe3O4.cif
Convolution
End