Structure-Sensitive Vibrations in Zeolites as Studied by Raman Scattering

1987 ◽  
Vol 111 ◽  
Author(s):  
R. G. Buckley ◽  
H. W. Deckman ◽  
J. M. Newsam ◽  
J. A. McHenry ◽  
P. D. Persans ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Lattice Dynamics ◽  
Nearest Neighbor ◽  
Low Frequency ◽  
Force Model ◽  
Vibrational Modes ◽  
Vibrational Assignments ◽  
Structure Sensitive ◽  
Bending Mode ◽  
Bond Bending

AbstractIn this paper we demonstrate the usefulness of a nearest neighbor force model for studying the structural dependence of the lattice dynamics of zeolites. Interpreting Raman scattering in the context of this model confirms earlier empirical vibrational assignments in zeolites and underlines the importance of short range forces in determining the frequencies of certain zeolite vibrational modes. The model describes fully the low frequency bond bending mode of A1 symmetry, although long range forces are shown to be required to model complete zeolite vibrational spectra.

Lattice Dynamics and Network Dynamics Calculations on Vibrational Modes of Lithium Borate Glasses

1990 ◽  
Vol 210 ◽  
Author(s):  
J. Deppe ◽  
M. Balkanski ◽  
R. F. Wallis ◽  
M. Massot
Keyword(s):  
Lattice Dynamics ◽  
Structural Changes ◽  
Structural Model ◽  
Nearest Neighbor ◽  
Network Dynamics ◽  
Borate Glasses ◽  
Vibrational Modes ◽  
Good Qualitative Agreement ◽  
Covalently Bonded ◽  
The Family

AbstractThe central force nearest neighbor model for glasses is used to discuss the Raman and infrared vibrational data for the family of lithium doped borate glasses B2O3 - xLi2O. The addition of the dopant is shown to cause local structural changes, including the transformation of three-coordinated borons to four-coordinated ones. An extremely simple structural model for the glass gives good qualitative agreement with experiment. The results of lattice dynamics calculations fall within the allowed frequency band limits predicted by network dynamics. The success of this model illustrates the importance of short range order on the vibrational spectra of covalently bonded solids.

Far infrared spectra and vibrational assignments of substituted benzenes

1967 ◽  
Vol 298 (1452) ◽  
pp. 51-63 ◽  
Keyword(s):  
Low Temperature ◽  
Low Frequency ◽  
Far Infrared ◽  
Marked Variation ◽  
Frequency Range ◽  
Substituted Benzenes ◽  
Low Frequencies ◽  
Vibrational Assignments ◽  
Bending Mode ◽  
Far Infrared Spectra

The vibrational absorption spectra of some substituted benzenes have been measured in the range 50 to 450 cm -1 . The compounds were measured as liquids, in solutions, as crystalline solidsat low temperature, and in polyethylene matrices. The extension of the infrared spectrum to very low frequencies has made it possible to determine new values for many fundamental vibrations. An assignment of all the vibrational frequencies in the low-frequency range has been made, from the infrared and Raman data, for p -dihalogeno-benzenes, p -halogenotoluenes, p -halogeno-nitrobenzenes, and for some mono-substituted benzenes. Some measurements have been made on the marked variation of intensity of the lowest frequency bending mode of p -dihalogeno-benzenes.

Probing the low-frequency vibrational modes of viruses with Raman scattering—bacteriophage M13 in water

2007 ◽  
Vol 12 (2) ◽  
pp. 024009 ◽  
Author(s):  
Kong T. Tsen ◽  
Eric C. Dykeman ◽  
Otto F. Sankey ◽  
Shaw-Wei D. Tsen ◽  
Nien-Tsung Lin ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Low Frequency ◽  
Vibrational Modes ◽  
Bacteriophage M13

Lattice dynamics of ZnTe, CdTe, GaP, and InP

1980 ◽  
Vol 58 (3) ◽  
pp. 351-358 ◽  
Author(s):  
M. S. Kushwaha ◽  
S. S. Kushwaha
Keyword(s):  
Lattice Dynamics ◽  
Present Model ◽  
Phonon Dispersion ◽  
Model Parameters ◽  
Force Model ◽  
Phonon Dispersion Curves ◽  
Bending Force ◽  
Zinc Blende ◽  
Bond Bending ◽  
Good Agreement

An eight-parameter bond-bending force model (BBFM), recently developed by us for zinc-blende (ZB) structure, has been used to study the lattice dynamics of other compounds of the II–VI and III–V groups. The model parameters were calculated using six critical point phonon frequencies, two elastic constants, and the lattice equilibrium condition. Phonon dispersion curves, phonon density of states, and Debye-characteristic temperatures have been calculated. The comparison of theoretical and the available experimental results reveals a fairly good agreement. The merits and demerits of the present model have been discussed in full.

ON THE THERMAL EXPANSION OF METALS AT LOW TEMPERATURES

1961 ◽  
Vol 39 (2) ◽  
pp. 263-271 ◽  
Author(s):  
G. K. Horton
Keyword(s):  
Thermal Expansion ◽  
Elastic Constants ◽  
Lattice Dynamics ◽  
Nearest Neighbor ◽  
Force Constants ◽  
Central Force ◽  
Force Model ◽  
Lattice Thermal Expansion ◽  
Interionic Potential ◽  
The Ideal

A theory is developed which correlates the thermal expansion of crystals to the anharmonicity introduced into Born's lattice dynamics by allowing the force constants of the crystal to vary with volume. This is achieved by identifying the force constants with the elastic constants of the crystal by the method of long waves. It is then assumed that it is primarily the volume dependence of the elastic constants that give rise to their temperature variation. A central force nearest and next-nearest neighbor force model analogous to Leighton's is applied to copper. The values of the lattice thermal expansion coefficient and of Grüneisen's parameter are given as a function of the temperature and found to agree quite well with the latest experimental results. It is pointed out that the description of the interionic potential in metals by a two-body central force is certainly a serious oversimplification and that the theory is likely to be more realistic for, say, the ideal inert solid gases, as soon as the experimental data becomes available.

A Study of the Temperature-Dependence of Low-Frequency, Raman-Active Phonons in Stage-2 Graphite-K and Graphite-Rb Intercalation Compounds

1982 ◽  
Vol 20 ◽  
Author(s):  
J. Giergiel ◽  
P. C. Eklund ◽  
R. Al-Jishi ◽  
G. Dresselhaus
Keyword(s):  
Phase Transitions ◽  
Raman Scattering ◽  
Temperature Dependence ◽  
Raman Spectra ◽  
Lattice Dynamics ◽  
Low Frequency ◽  
Frequency Region ◽  
Intercalation Compounds ◽  
Dynamics Model ◽  
Scattering Study

ABSTRACTWe report results from a Raman scattering study of stage 2 Graphite-Rb and Graphite-K in the low frequency region (ω < 150 cm-1) as a function of temperature (80K < T < 300K). Four features are seen in the 80K spectra and are interpreted in terms of a Born– von Kármán lattice dynamics model. The temperature-dependence of the Raman spectra is discussed in connection with reported phase transitions in stage 2 alkalimetal graphite compounds.

Low-frequency raman scattering on surface vibrational modes of microcrystals

1988 ◽  
Vol 67 (7) ◽  
pp. 725-729 ◽  
Author(s):  
V.K. Malinovsky ◽  
V.N. Novikov ◽  
A.P. Sokolov ◽  
V.G. Dodonov
Keyword(s):  
Raman Scattering ◽  
Low Frequency ◽  
Vibrational Modes

Light Scattering from Glass-forming Molten Salts

2002 ◽  
Vol 57 (1-2) ◽  
pp. 65-70 ◽  
Author(s):  
A. G. Kalampounias ◽  
G. N. Papatheodorou ◽  
S. N. Yannopoulos
Keyword(s):  
Glass Transition ◽  
Light Scattering ◽  
Raman Scattering ◽  
Molten Salts ◽  
Low Frequency ◽  
Vibrational Modes ◽  
Halide Salt ◽  
Glass Forming ◽  
Salt Mixtures ◽  
Experimental Findings

Raman scattering has been employed to study the temperature and polarization dependence of the vibrational modes for the glass-forming halide salt mixtures xZnCl2-(1-x)AlCl3, with x = 0.8 and 0.6. The analysis has shown that the vibrational modes of the mixtures arise from a contribution of the vibrational modes of the pure components salts. Emphasis has also been given to the low-frequency modes (3 - 80 cm-1), and particular points related to the glass transition phenomenology are discussed in view of the experimental findings.

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