Resonance Raman Spectroscopy; Theory and Experiment · Resonance Raman Spectroscopy; Theory and...
Transcript of Resonance Raman Spectroscopy; Theory and Experiment · Resonance Raman Spectroscopy; Theory and...
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Resonance Raman Spectroscopy;
Theory and Experiment
2013.11.13
Carl-Zeiss Lecture 2
IPHT Jena
Hiro-o HAMAGUCHI
Department of Applied Chemistry and Institute of Molecular
Science, College of Science, National Chiao Tung University,
Taiwan
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Landmarks of Raman Spectroscopy (HH view)
Kramers-Heisenberg-Dirac Dispersion Formula
Placzek Polarizability Theory
Albrecht Vibronic Theory
Resonance Raman Spectroscopy
Time-resolved Raman Spectroscopy
(Non-linear Raman, SERS, Raman Microspectroscopy, …. still moving)
……….
Raman microspectroscopy of Living Cells
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Theoretical Framework of Raman Spectroscopy
K-H-D Dispersion Formula
Placzek Polarizability Theory Albrecht Vibronic Theory
Off-resonance On-resonance
, Dv = 1
Polarization rule
Totally symmetric mode: 0≤r<0.75
Non-totally symmetric mode: r=0.75
Selection rule
Polarization rule
Totally symmetric mode: 0≤r<∞
Non-totally symmetric mode: 0≤r<∞
Selection rule
Totally symmetric mode: Dv ≧1
Non-totally symmetric mode: Dv = 1,2
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Theory of Raman Scattering (1)
Kramers-Heisenberg-Dirac dispersion formula
PAM Dirac
(1902-1984)
P. A. M. Dirac, Principle of Quantum Mechanics
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Quantum Theory of Raman Scattering The initial and final states of Raman scattering
In the quantum theory of Raman scattering, we calculate the probability for an optical process in which an incident photon with angular frequency wi and polarization vector ei is annihilated and a new scattered photon with ws and es is created with a concomitant molecular transition from the initial state |m> to the final state |n>.
The photon number state is expressed as |ni,ns>, where ni stands for the number of phton with wi and ei, ns that for ws and es. The initial state |i> and the final state |f> of Raman scattering are expressed as the products of the photon and the molecular states as;
|i>=|ni,ns>|m>
|f>=|ni-1,ns+1>|n>
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The second-order perturbation theory
initial
final
Inter-
mediate
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The intermediate states of Raman scattering
The Raman scattering process is obtained as a second order perturbation of the light-matter interaction. There are two kinds of intermediate states that can combine the initial and final states by a one-photon transition induced by a perturbation mE.
|v1>=|ni-1,ns>|e>
|v2>=|ni,ns+1>|e>
|v1> corresponds to the state in which an incident photon is annihilated with a molecular transition from |m> to |e> (figure-a, absorption resonance) and |v2> to that in which one scattered photon is created with |m> to |e> (figure-b, emission resonance).
The contribution of the second intermediate state is characteristic of Raman scattering that distinguishes Raman scattering from fluorescence.
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Kramers-Heisenberg-Dirac dispersion formula In the quantum theory of Raman scattering, it is convenient to use photon flux F in stead of intensity I, I=hωC/2π, where hω/2π is the photon energy. F indicates the number of photons transmitted per unit time through unit area. The second order perturbation theory gives the following formula that connects the scattered photon number per unit time FsR
2 and the incident photon flux Fi.
|v1>=|ni-1,ns>|e> with Ev1 – Em = -ħwi + Ee – Em = Ee – Em - Ei
|v2>=|ni,ns+1>|e> with Ev2 – Em = ħws + Ee – Em = Ee – Em – Es = Ee – En + Ei
Here, ei and es are the unit polarization vectors of the incident and scattered photons, ars is the Raman scattering tensor with s and r being (x,y,z), and Ds and Dr are the rs component of the electric dipole moment.
s
s
r
r
|m> |n>
|e>
|m> |n>
|e>
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Theoretical Framework of Raman Spectroscopy
K-H-D Dispersion Formula
Placzek Polarizability Theory Albrecht Vibronic Theory
Off-resonance On-resonance
, Dv = 1
Polarization rule
Totally symmetric mode: 0≤r<0.75
Non-totally symmetric mode: r=0.75
Selection rule
Polarization rule
Totally symmetric mode: 0≤r<∞
Non-totally symmetric mode: 0≤r<∞
Selection rule
Totally symmetric mode: Dv = ≧1
Non-totally symmetric mode: Dv = 1,2
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Placzek’s polarizability theory of off-resonance Raman scattering
By introducing an adiabatic approximation, |m >=|g]|i), |n>=|g]|f), |e>=|e]|v),
we obtain the formula for vibrational Raman scattering.
In off-resonance Raman scattering, Eev-Egi» Ei and therefore Eev-Egi-Ei is much larger than the vibrational energies. Then Eev-Egi-Ei+iG~ Ee-Eg-Ei holds with a good approximation. Then the closure property S|v><v|=1 simplifies the KHD formula to the following form.
The Raman scattering tensor component ars is approximately given by the vibrational matrix element of the polarizability tensor component ars (Placzek polarizability theory).
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Selection rule for off-resonance Raman scattering
The initial vibrational state |i) and the final vibrational state |f) are expressed as the products of vibratioal states,
|i) = P|vki> (12), |f) = P|vkf>, (13)
where vki and vkf are the vibrational quantum numbers of the k-th vibrational mode in the initial and final states.
The polarizability component ars is expanded into a power series of normal coordinates Qk.
(14)
Under a harmonic approximation, the vibrational matrix element of the polarizabilty component is given in the following form.
(15)
We finally obtain the selection rule of off-resonance Raman scattering.
(16) and Dvk=vkf – vki = ±1 (17)
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Polarizability Theory of Vibrational Raman Scattering
1) Off-resonance condition, 2) Non-degenerate condition
Totally symmetric mode:
G0≠0, Ga=0, Gs≠0 0≤r<0.75
Non-totally symmetric mode:
G0=0, Ga=0, Gs≠0 r=0.75
G. Placzek (1905-1955)
Incident light
Scattered light
Depolarization ratio r = I┴ / I// = Iy / Ix =
S
Selection rule
, Dv = ±1
ars = a0rs + aa
rs + asrs
G0=S(a0rs)2, Ga=S(aa
rs)2, Gs=S(asrs)2
Theory of Raman Scattering (2)
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T. Shimanouchi, Tables of Molecular Vibrational Frequencies, NSRDS-NBS 39, p. 97.
Depolarized Totally-symmetric Raman Band?
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Polarization rule: tanfR=rtanq (r ; Raman depolarization ratio)
Sample
k1
k2
kCARS
Polarization-resolved CARS Spectroscopy
w1 ( 0o )
w2 ( q=60o )
wCARS (fR) Analyzer (fa)
Energy conservation:
wCARS =2w1-w2=w1+W
Momentum conservation:
k = 2k1-k2
w1 w2 w1 wCARS
W
p: r<0.75
Totally symmetric mode
dp: r=0.75
Non-totally symmetric mode
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Polarization-resolved CARS Spectroscopy
q=60o
Variable fa
Y. Saito, T. Ishibashi, H. Hamaguchi, J. Raman Spectrosc., 31, 725-730 (2000).
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Polarization-resolved CARS Spectra of Liquid Cyclohexane 2
R21
R
G)ww(w
G
=
R R
RNR
i
HACARSI
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CH2 twist (eg) 1267 cm-1 0.749±0.002
CH2 scissors (eg) 1445 cm-1 0.750±0.002
Depolarization Ratios of Two eg Bands of Cyclohexane
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gauche CH2 scissors (a) 1429 cm –1 0.746±0.003
trans CH2 scissors (ag) 1443 cm –1 0.742±0.003
Depolarization Ratios of Two Totally-symmetric Bands of
1,2-dichloroethane
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T. Shimanouchi, Tables of Molecular Vibrational Frequencies, NSRDS-NBS 39, p. 97.
Depolarized Totally-symmetric Raman Band?
dp → p
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Resonance Raman scattering
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Theoretical Framework of Raman Spectroscopy
K-H-D Dispersion Formula
Placzek Polarizability Theory Albrecht Vibronic Theory
Off-resonance On-resonance
, Dv = 1
Polarization rule
Totally symmetric mode: 0≤r<0.75
Non-totally symmetric mode: r=0.75
Selection rule
Polarization rule
Totally symmetric mode: 0≤r<∞
Non-totally symmetric mode: 0≤r<∞
Selection rule
Totally symmetric mode: Dv = ≧1
Non-totally symmetric mode: Dv = 1,2
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Vibrational Raman scattering and electronic resonance
In vibrational Raman scattering in the ground electronic state, the initial, final and intermediate states are expressed as the products of the electronic and vibrational parts as,
|m >=|g]|i)
|n>=|g]|f)
|e>=|e]|v)
where | ] stands for electronic state and | ) for vibrational state; |g] is the ground electronic state and |e] the excited electronic state(s), and |i), |f),|v) are the initial, final and intermediate vibrational states, respectively.
In off-resonance Raman scattering (a), Eev-Egi» Ei and therefore many excited electronic states S |e] )|v) contribute (virtual intermediate states). In pre-resonance Raman scattering, Ei become close to Eev-Egi and the vibrational states of the lowest excited electronic state |e]S|v) play the role of interemediate states. In rigorous resonance Raman scattering, Eev-Egi~ Ei and one particular vibronic state |e]|v) dominates the scattering process.
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Hmol=Hmole+ Hmol
v +Hmolev (41)
Hmole|g0]= Eg
0|g0] (42)
Hmole|e0]= Ee
0|e0] (43)
Hmole|s0]= Es
0|s0] (44)
Hmolv|i)= Ei
0|i) (45)
Hmolv|v)= Ev
0|v) (46)
Hmolv|f)= Ef
0|f) (47)
For resonance Raman scattering, we need to take explicitly the vibronic nature of
the intermediate states. We write the molecular Hamiltonian with three terms,
electronoc, vibrational and vibronic terms..
We treat Hmolev as a perturbation to Hmol
e and Hmolv. We consider three zero-order
electronic states, ground electronic state |g0], the resonant excited electronic state
|e0] and another excited electronic state |s0]. They satisfy the following equations.
Three vibrational states are the initial vibrational state |i), intermediate vibrational
state |v) and the final vibrational state |f).
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With the first-order perturbation theory, we obtain an expression for the first-order
intermediate electronic state (Herzberg-Teller expansion)
Introducing all into the KHD formula, we obtain an expression for a Raman
scattering tensor under a resonance condition (Albrecht 1961).
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Theory of Raman Scattering (3)
Albrecht’s vibronic theory of resonance Raman Scattering
ars ~ A + B
A term: Franck-Condon term
Totally symmetric modes
high overtones
B term: Vibronic coupling
Non-totally symmetric modes
overtones?
A. C. Albrecht
(1927-2002)
A. C. Albrecht, J. Chem. Phys. 34, 1476 (1961).
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n1 (a1g)
n2 (eg)
n5 (t2g)
r=0.75 r=0.75 r=0
1 0 0
0 1 0
0 0 1
1 0 0
0 -1 0
0 0 0
0 1 0
1 0 0
0 0 0
a1g ~ eg ~ t2g ~
Raman Active Vibrations of MX6 Octahedral Complexes
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Resonance Raman spectrum of PtI62-
Totally symmetric mode (n1, 2n1, 3n1) → A term
Non-totally symmetric mode ( n2, 2n2, n1+n2, 2n1+n2 ) → B term
PtI62-
488.0 nm excitation
H. Hamaguchi, I. Harada, T. Shimanouch, J. Raman Spectrosc., 2, 517-528 (1974).
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Polarized Resonance Raman Spectra of PtI62-
PtI62-
488.0 nm excitation
n1, 2n1, 3n1 bands r=0 ; n2 band r=0.75
H. Hamaguchi, J. Chem. Phys., 69, 569-578 (1978).
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IrBr62-
568.2 nm excitation
r=1 for all bands;
H. Hamaguchi, J. Chem. Phys., 66, 5757-5768 (1977); 69, 569-578 (1978).
Polarized Resonance Raman Spectra of IrBr62-
forgot to rotate the analyzer?
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Ground-state Electron Configuration and Electronic
States of Octahedral MX6 Complexes
PtI62- IrBr6
2- OsCl62-
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Gg=a1g, Ge=t1u
|e(x)><e(x)|
|g> |e(y)><e(y)| |g>
|e(z)><e(z)|
x x
y y
z z
1 0 0
0 1 0
0 0 1
G0=3, Ga=0, Gs=0 r=3Gs/(10G0+4Gs)=0
Raman Scattering Tensor and Depolarization Ratio of the
Totally Symmetric Mode of Non-degenerate PtI62-
Ion
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Ground-state Electron Configuration and Electronic
States of Octahedral MX6 Complexes
PtI62- IrBr6
2- OsCl62-
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|e(a)><e(a)| |g(b)> |g(b)>
|e(b)><e(b)|
|e(a)><e(a)| |g(b)> |g(a)>
|e(b)><e(b)|
|e(a)><e(a)| |g(a)> |g(b)>
|e(b)><e(b)|
iz
x+iy
iz
x-iy
x+iy
Raman Tensors for the a1g Vibrational Transitions of MX6
in an Eg” Ground Electronic State
|e(a)><e(a)| |g(a)> |g(a)>
|e(b)><e(b)|
iz -iz
x-iy x+iy
1 i 0
-i 1 0
0 0 1
0 0 -i
0 0 -1
i 1 0
0 0 -i
0 0 1
i -1 0
1 -i 0
i 1 0
0 0 1
x-iy
iz -iz
-iz
x+iy
x-iy
-iz
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Raman Tensors for the a1g Vibrational Transitions of MX6
in an Eg” Ground Electronic State and Depolarization Ratio
|g(a)> |g(a)> 1 i 0
-i 1 0
0 0 1
0 0 -i
0 0 -1
i 1 0
0 0 -i
0 0 1
i -1 0
1 -i 0
i 1 0
0 0 1
|g(a)> |g(b)>
|g(b)> |g(a)>
|g(b)> |g(b)>
G0=3, Ga=2, Gs=0
G0=0, Ga=4, Gs=0
G0=3, Ga=2, Gs=0
G0=0, Ga=4, Gs=0
G0=6, Ga=12, Gs=0 r=(3Gs+5Ga)/(10G0+4Gs)=1
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Symmetry of Raman Scattering Tensor
Irreducible representations:
Gi: the initial states, Gf: the final state, GR: Raman tensor
GR = Gi x Gf
Vibrational Raman Scattering:
Gi = gg x g1, Gf = gg x gv and therefore GR = gg x gg x gv
where gg: the ground electronic state and gv: vibrational state
A1g Vibrational Raman Scattering:
d6 PtI62- gg = a1g, gv = a1g and therefore GR = a1g r = 0
d5 IrBr62- gg = eg” gv = a1g and therefore gR = a1g + t1g 0 < r < ∞
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Depolarization Ratio in Vibrational Raman Scattering
Polarizability theory (Placzek, 1934)
1) Non-resonant condition, 2) Non-degenerate condition
Totally symmetric modes: G0≠0, Ga=0, Gs≠0 0≤r<0.75
Non-totally symmetric modes: G0=0, Ga=0, Gs≠0 r=0.75
Breakdown of the Placzek polarizability theory
1) Non-resonant condition (Spiro, 1972)
Non-totally symmetric modes : G0=0, Ga≠0, Gs ≠ 0 0.75<r< ∞
2) Non-degenerate condition (Hamaguchi, Harada, Shimanouchi,1975)
Totally symmetric modes : G0≠0, Ga≠0, Gs=0 0<r< ∞
Placzek’s prediction was proved after 40 years to establish firmly the
theoretical basis of Raman spectroscopy.
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Cyanobacteria
Page 39
Cell
Membrane
Thylakoid
Membrane
H2O O2+2H+ 1 2
PQ
e-
H+
H+
PC
PSII PSI
NADP+ + H+
NADPH
Cyt.
b6/f
hn
hn
Thylakoid
membrane
Photosynthetic microorganism
Origin of chloroplast
Model organism for
photosynthesis research
A. Herrero, E. Flores, The Cyanobacteria: Molecular Biology, Genetics and Evolution. Caister Academic Press (2008)
Eukaryote
Bacteria
Cyanobacteria
Endosymbiosis
Algae, Plant
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Pigments contained in cyanobacteria
Carotenoid Phycobilin
Chlorophyll a
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0
Inte
nsi
ty
1600 1400 1200 1000 800
Raman shift / cm-1
NIR Raman measurements of cyanobacteria
Page 41
1 mW; 150 sec
Thermosynechococcus elongatus
Thermophilic cyanobacteria
(Unicellular rod-shaped)
Well-established model organism
-Entire genome sequenced
785 nm
1064 nm
0
Inte
nsi
ty
1600 1400 1200 1000 800
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1064 nm Excited Raman Spectrpscopy with InP/InGaAsP
Multichannel Detector 1064 nm
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1064 nm Excited Multichannel Raman Microspectrometer
Page 43
, 30 ns
II: Image Intensifier
(Hamamatsu Photonics)
Spatial resolution: Lateral 0.7 μm, Depth 3.1 μm Spectral resolution: 10 cm-1
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NIR Raman measurements of cyanobacteria
Page 44
Inte
nsity
1500 1000 500
Raman shift / cm-1
Inte
nsity
1800 1600 1400 1200 1000
Raman shift / cm-1
785 nm; 0.6 mW 1064 nm; 0.6 mW
0 sec
30
60
90
120
150
0 sec
30
60
90
120
150
Deep near-infrared excitation is needed for avoiding the photodamage.
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Sin
gula
r va
lue
403020100
Space-resolved Measurements and SVD Noise Filtering
Page 45
5mm
○ Singular value decomposition as noise filter1)
A = USVT
403020100
0
4000
3000
2000
1000
0
Inte
nsity
/ a.
u.
1800 1600 1400 1200 1000
Raman shift / cm-1
3000
2000
1000
0
Inte
nsity
/ a.
u.
1800 1600 1400 1200 1000
Raman shift / cm-1
SVD
13 x 22 pix
(0.3mm interval)
0.5 mW,
10 sec / pix
1) N. Uzunbajakava, C. Otto, et al. Biophysical Journal (2003) 3968-3981.
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Inte
nsity
1800 1600 1400 1200 1000
Raman shift / cm-1
Space-resolved Raman Spectra within a Cell
Page 46
5mm
A B
C
A
B
C
0.5 mW,
10 sec / pix
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Inte
nsity
1800 1600 1400 1200 1000
Raman shift / cm-1
Band assignments
Page 47
1800 1700 1600 1500 1400 1300 1200 1100 1000 900
b-carotene (1064nm Raman spectrum)
A
B
C
1523 1157
1008 5mm
A B
C
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Inte
nsity
1800 1600 1400 1200 1000
Raman shift / cm-1
A
B
C
Band assignments
Page 48
1800 1700 1600 1500 1400 1300 1200 1100 1000 900
Phycobilin
1635
1586 1369 1279
5mm
A B
C
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Inte
nsity
1800 1600 1400 1200 1000
Raman shift / cm-1
A
B
C
Band assignments
Page 49
1325 1229
1800 1700 1600 1500 1400 1300 1200 1100 1000 900
Chlorophyll a
5mm
A B
C
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Inte
nsity
1800 1600 1400 1200 1000
Raman shift / cm-1
A
B
C
Band assignments
Page 50 Almost all bands are assignable to the three photosynthetic pigments ⇐ Due to pre-resonance effect.
1523
1157
1008
1635
1586 1369 1279
1325 1229
PB Car Chl
5mm
A B
C
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Raman mapping images
Page 51
Phycobilin Carotenoid Chlorophyll
1225
1157 1325
1008 cm-1
~1523 1279
1369
1586
1635
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Functions of photosynthetic pigments
Carotenoid Phycobilin Light harvesting
Chlorophyll a Reaction center
Light harvesting
Cell
Membrane
Thylakoid
Membrane
H2O O2+2H+ 1
2
PQ
e-
H+
H+
PC
PSII PSI
NADP+ + H+
NADPH
Cyt.
b6/f
hn
hn
Thylakoid
membrane
Light harvesting
Antioxidant
Photoprotection
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9
Resonance Raman Quantification of Carotenoids in Human Serum
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Absorption Spectra of ß-carotene / cyclohexane (8 mg/L)
absorb
ance
wavelength / nm
λmax
good choice for
resonance Raman 488
530
514
632 647 568
461
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Raman shift / cm-1
488 nm, 2 mW, 2 s
514 nm, 1 mW, 2 s
530 nm, 1 mW, 2 s
v2
v3
v1
Raman Spectra of Serum with Different
Excitation Wavelength
(C-C)
(C-H)
(C=C)
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Raman Spectra of Serum with Different
Excitation Wavelength
Raman shift / cm-1
1522 cm-1
1518 cm-1
1514 cm-1
v1 peak position v1
514 nm
488 nm
530 nm
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Characteristic of Serum Carotenoids
(E-Siong, 1999)
Proportion of individual carotenoids
0.40
mean concentration (µmol/L)
0.36
0.34
0.22
0.08
58
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Normalized Intensity of Cyclohexane Band 801 cm-1 to the
same number of incident photon and Raman scattering
cross-section.
Lutein, ß-Carotene, ß-Crytoxanthin and α-Carotene have very similar
v1 peak position, apart from Lycopene.
Raman Spectra of Carotenoids
Raman shift / cm-1 Raman shift / cm-1 Raman shift / cm-1
530 nm ex. 514 nm ex. 488 nm ex. v1 v1 v1
Lutein
ß-Carotene
ß-Crytoxanthin
α-Carotene
Lycopene
Lutein
ß-Carotene
ß-Crytoxanthin
α-Carotene
Lycopene
Lutein
ß-Carotene
ß-Crytoxanthin
α-Carotene
Lycopene
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Normalized Intensity of Cyclohexane Band 801 cm-1 to the
same number of incident photon and Raman scattering
cross-section.
wavelength / nm
Ab
so
rba
nce
Lutein, α-Carotene, ß-Crytoxanthin and ß-Carotene have very similar
absorption characteristics, apart from Lycopene.
Absorption Spectra of Carotenoids
488
530 nm laser
514 Lycopene
Lutein
ß-Carotene
ß-cryptoxanthin
α-Carotene
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476.5
449.0
455.8
455.4
450.1
λmax (nm)
v1 (cm-1)
1512.8
1524.4
1523.7
1523.3
1524.8
(E-Siong, 1999)
Two Groups of Carotenoids in Serum
Component 1 : Lycopene
Component 2: Represented by ß-Carotene
61
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≈
Fitting the Observed Band with Two Components
Serum Carotenoids v1
Component 1 Lycopene
Component 2 ß-Carotene
≃ +
Raman shift / cm-1 Raman shift / cm-1 Raman shift / cm-1
1512.8 cm-1 1524.0 cm-1 1518.0 cm-1
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63
≈
488 nm ex.
Overlay
A Global Analysis
Component 1 Component 2
Component 1 Lycopene
Component 2 ß-Carotene
Serum Carotenoids v1
Raman shift / cm-1 Raman shift / cm-1 Raman shift / cm-1 Raman shift / cm-1 Raman shift / cm-1
≃ + = →
≃ + = →
≃ + = →
1512.8 1524.0
514 nm ex.
530 nm ex.
1512.8 cm-1 1524.0 cm-1
1518.0 cm-1 1518.0 cm-1
1522.4 cm-1 1522.1 cm-1
1512.8 cm-1 1524.0 cm-1
1513.5 cm-1 1513.6 cm-1 1512.8 cm-1 1524.0 cm-1
+
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488 nm
514 nm
530 nm
89 100 100 96 85 80 97 88 95
11 0 0 4 15 20 3 12 5
52 45 41 52 41 47 55 56 54
48 55 59 48 59 53 45 44 46
84
3
90 95 97 90 74 76 75
Component 1 Lycopene
Component 2 ß-Carotene
Proportion of Components Amplitude after Global Analysis
%
97
10 5 16 3 10 26 24 25
100
75
50
25
0
% 100
75
50
25
0
% 100
75
50
25
0