Raman scattering from impurities in nonmetals. II. Anharmonic effects

1979 ◽  
Vol 57 (1) ◽  
pp. 11-22
Author(s):  
H. C. Chow
Keyword(s):  
Raman Spectrum ◽  
Raman Scattering ◽  
Raman Line ◽  
Life Time ◽  
Resonant Scattering ◽  
Time Effect ◽  
Dipole Radiation ◽  
Anharmonic Effects ◽  
Spectrum Function

Anharmonic effects on the impurity Raman spectrum are examined on the basis of an approximately derived, nonphenomenological Raman spectrum function. It is shown that owing to the phonon life-time effect, anharmonicity broadens the zero-phonon Raman line and the accompanied satellite phonon Raman lines. The case of resonant scattering is re-examined and the result suggests that the dipole radiation formulation of Raman scattering, which is the basis of the present and some other treatments, is unsuited for demonstrating hot luminescence.

X-ray Raman scattering on polycrystalline graphite in the scattering angle range 0–120°

1983 ◽  
Vol 61 (4) ◽  
pp. 629-632 ◽  
Author(s):  
Z. I. Kavogli ◽  
D. K. Leventouri ◽  
C. N. Koumelis
Keyword(s):  
Raman Spectrum ◽  
Raman Scattering ◽  
Raman Line ◽  
Scattering Angle ◽  
X Ray ◽  
Peak Intensity ◽  
Polycrystalline Graphite

X-ray Raman scattering was studied on polycrystalline graphite for various scattering angles in the range 0–120°. A mosaic graphite spectrometer without collimators and Crkβ radiation were used.The shape of the Raman spectrum depended slightly on the scattering angle. The peak intensity of the Raman line increases with scattering angle but in a different way to that resulting from the calculation of Mizuno and Ohmura. Additional components were observed in the spectrum on both sides of the Raman line.

Raman Spectrum of TlCl0.6Br0.4 near Resonance

1973 ◽  
Vol 51 (15) ◽  
pp. 1657-1663 ◽  
Author(s):  
N. Krishnamurthy ◽  
B. H. Torrie
Keyword(s):  
Raman Spectrum ◽  
Raman Scattering ◽  
Single Crystals ◽  
Mixed Crystal ◽  
Resonant Scattering ◽  
Excitation Wavelength ◽  
Scattering Mechanism ◽  
Near Resonance ◽  
Exciting Wavelength ◽  
Densities Of States

Raman scattering from single crystals of TlCl0.6Br0.4 has been observed both as a function of temperature and excitation wavelength. The spectra exhibit strong one-phonon Raman scattering at 17 and 37 cm−1 and a weak two-phonon band centered at 296 cm−1, close to twice the LO frequency (q = 0) of the mixed crystal. From the temperature dependence and the calculated one- and two-phonon densities of states, it is shown that the 37 cm−1 line and the tail following it are an admixture of first- and second-order Raman scattering. The enhancement of the intensity of the 296 cm−1 band when the exciting wavelength is decreased from 5145 Å to 4545 Å is attributed to the resonant-scattering mechanism proposed by Fontana and Mulazzi.

Theoretical Analysis of Time-Resolved Coherent Anti-Stokes Raman Scattering Method for Obtaining the Whole Raman Spectrum of Biomolecules

2010 ◽  
Vol 30 (7) ◽  
pp. 2136-2141
Author(s):  
尹君 Yin Jun ◽  
于凌尧 Yu Lingyao ◽  
屈军乐 Qu Junle ◽  
牛憨笨 Niu Hanben ◽  
林子扬 Lin Ziyang
Keyword(s):  
Raman Spectrum ◽  
Theoretical Analysis ◽  
Raman Scattering ◽  
Scattering Method ◽  
Time Resolved ◽  
Anti Stokes

scholarly journals Hydration and ion pair formation in common aqueous La(iii) salt solutions – a Raman scattering and DFT study

2015 ◽  
Vol 44 (1) ◽  
pp. 295-305 ◽  
Author(s):  
Wolfram W. Rudolph ◽  
Gert Irmer
Keyword(s):  
Raman Spectrum ◽  
Raman Scattering ◽  
Ion Pair ◽  
Pair Formation ◽  
Dft Study ◽  
Salt Solutions ◽  
Left Hand ◽  
Ion Pair Formation ◽  
Right Hand

Left hand side: Raman spectrum of a 0.622 mol L−1La(ClO4)3(aq). Weak, polarized band at 343 cm−1assigned to symmetric La–O stretch of [La(OH2)9]3+. Bands at 463 and 630 cm−1due to ClO4−(aq). The inset shows the isotropic band in more detail. Right hand side: Structure of [La(OH2)9]3+(symmetryD3).

FIRST ORDER RAMAN SCATTERING FROM SEMICONDUCTOR QUANTUM DOTS

1989 ◽  
Vol 03 (08) ◽  
pp. 1167-1181 ◽  
Author(s):  
P.A.M. RODRIGUES ◽  
HILDA A. CERDEIRA ◽  
F. CERDEIRA
Keyword(s):  
Crystal Structure ◽  
Quantum Dots ◽  
Raman Spectrum ◽  
Raman Scattering ◽  
Bulk Material ◽  
Semiconductor Quantum Dots ◽  
Polycrystalline Materials ◽  
Nanometer Size ◽  
First Order ◽  
Linear Dimensions

We develop a model appropriate for describing the Raman spectrum of samples, containing a collection of semiconductor quantum dots with and without dispersion in their linear dimensions. These nanometer size crystallites are assumed to have the same atomic arrangement as that of the bulk material and to be embedded in a host material made up of a different semiconductor of the same crystal structure. The results from our calculations are compared to previous models for polycrystalline materials.

Raman-scattering probe of anharmonic effects due to temperature and composition in InGaN

2012 ◽  
Vol 250 (2) ◽  
pp. 329-333 ◽  
Author(s):  
J. F. Kong ◽  
W. Z. Shen ◽  
Q. X. Guo
Keyword(s):  
Raman Scattering ◽  
Anharmonic Effects

Raman-scattering probe of anharmonic effects in GaAs

1995 ◽  
Vol 51 (23) ◽  
pp. 16660-16667 ◽  
Author(s):  
Prabhat Verma ◽  
S. C. Abbi ◽  
K. P. Jain
Keyword(s):  
Raman Scattering ◽  
Anharmonic Effects

Analysis and Explanation of Agglomeration Phenomenon Based on Raman Spectrum

2015 ◽  
Vol 1096 ◽  
pp. 288-291
Author(s):  
Hai Ling Li ◽  
Geng Xin Sun ◽  
Shui Qing Jiang ◽  
Sheng Bin
Keyword(s):  
Raman Spectrum ◽  
Raman Scattering ◽  
Spectrum Analysis ◽  
Material Science ◽  
Gallium Phosphide ◽  
Basic Fuchsin ◽  
Molecular Configuration

In this paper, from the standpoint of Raman spectrum research aspect in material science, Raman spectrum analysis of graphite and diamond microcrystal retained by gallium phosphide nanoparticles is introduced. We found that molecular configuration of basic fuchsin adsorbed on gallium phosphide nanoparticles through experiments. Based on these, Raman scattering is used for analyzing basic fuchsin adsorbed on surface of gallium phosphide nanoparticles. Moreover, we discuss the corresponding meanings of agglomeration phenomenon from the perspective of material.

The single crystal Raman spectrum of orthorhombic PbCl2

1970 ◽  
Vol 48 (18) ◽  
pp. 2931-2933 ◽  
Author(s):  
G. A. Ozin
Keyword(s):  
Raman Spectrum ◽  
Raman Scattering ◽  
Single Crystal ◽  
Lattice Vibrations ◽  
Polarized Raman ◽  
Oriented Single Crystal

The frequencies and symmetries of the even parity lattice vibrations of orthorhombic lead dichloride are determined by means of polarized Raman scattering from an oriented single crystal. The frequencies of the vibrations are interpreted in terms of symmetry co-ordinates and by comparison with the modes of the isomorphous lead dibromide.

Intermolecular Vibrations in Fullerene Systems

1994 ◽  
Vol 359 ◽  
Author(s):  
M.G. Mitch ◽  
G.P. Lopinski ◽  
J.S. Lannin
Keyword(s):  
Raman Spectrum ◽  
Alkali Metal ◽  
Raman Scattering ◽  
Octahedral Site ◽  
Low Frequency ◽  
Bulk Materials ◽  
Complementary Information ◽  
Disorder Effects ◽  
Site Disorder ◽  
Intermolecular Vibrations

ABSTRACTIntermolecular vibrations in a variety of fullerene systems are reported that provide information on C60-C60 and alkali-metal - C60 interactions and disorder effects. Low frequency Raman scattering in laser polymerized C60 films are shown to exhibit additional modes not reported for bulk materials. This result is consistent with recent dimer calculations. Raman scattering and HREELS measurements are shown to provide complementary information on alkali-metal motions in K3C60. In FCC Na6C60 both octahedral site disorder effects and reduced Na-C bond lengths account for changes in the Raman spectrum relative to Na3C60.

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