Vibrational relaxation in liquid methyl iodide.

Döge, G.; Arndt, R.; Khuen, A.

doi:10.1016/0301-0104(77)85178-1

Cited by 97 publications

(18 citation statements)

References 23 publications

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“…Several points are cogent: (1) with the single exception of the 1384 cm-' signal (where some problem was encountered in the deconvolution of the DSP results), the dephasing times are larger in the DSP. (2) No gradual change in dephasing times with temperature change was noted. The increase in dephasing times occurred abruptly just beyond the freezing point.…”

Section: Methodsmentioning

confidence: 99%

Mechanistic interpretations of vibrational dephasing processes in 1,1,1‐trichloroethane by spontaneous Raman spectroscopy

Baglin

1979

J Raman Spectroscopy

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The Raman signals from modes vl, v2, v3, 2v2 and 2vg of l,l,l-trichloroethane have been examined by varying the concentration of this molecule in several solvents. In addition temperature studies were conducted, including data from the disordered solid phase of the neat sample. The results of these studies show that (a) the fundamentals (vl, v2 and v3) are involved in a dephasing process controlled by the intramolecular potential function, (b) dephasing processes of the overtones are dominated by intermolecular processes and (c) the v2 and v3 modes of this molecule show very little dilution effects (some broadening), whereas the same modes of the structurally similar molecule CH31 show a definite narrowing in similar solvents. The theoretical model, proposed by Rothschild, is used to strengthen the interpretative case offered for the mechanistics of the dephasing processes of the fundamental modes.

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Section: Methodsmentioning

confidence: 99%

Mechanistic interpretations of vibrational dephasing processes in 1,1,1‐trichloroethane by spontaneous Raman spectroscopy

Baglin

1979

J Raman Spectroscopy

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“…Substituting from Eqn (4) into Eqn ( l l ) , taking the weak coupling limit and rearranging, we finally obtain rs=K(rn) =rED+rPM+rrRFr (24) and for the fundamental band ( 2 5 ) I: (26) …”

Section: Or T B / T S = T I Kmentioning

confidence: 99%

Isotropic Raman band shape and vibrational relaxation for molecules in the liquid state: A Critical study of some band shape functions

Fujita

Fukuda

Fukushi

et al. 1985

J Raman Spectroscopy

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A band shape function for the isotropic Raman scattering described in terms of the band width in the weak coupling limit and the relaxation time of the bath mode has been proposed by summing the results of Berne el al. [ J . Chem. Phys. 45, 1086 (1966)X Wang [Mol. Phys. 33, 207 (1977)l and Knauss [Mol. Phys. 36,413 (1978)l. The results of band analyses with this function have been compared with those obtained frum other conventionally used band shape and correlation functions. The present function is preferable for precise interpretation of vibrational relaxation mechanisms, particularly for those cases where temperature and concentration dependence of the band parameters are involved.

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“…To account for the effect of the solvent molecules outside the cage, the function obtained was multiplied by a function closely resembling C2(t ) as defined above. The intermolecular potential E,(qi ) is given by a sum of Lennard-Jones (6)(7)(8)(9)(10)(11)(12) contributions: dispersive terms OH ... CC14 (located on the oxygen atom) and X ... CC14, and repulsive terms X ... CC14, O... CC14 and H... CC14. The r and a values from which the potential terms were obtained are presented in table 1, together with data on the vibrational properties of the standard OH group (taken as the OH stretching of methanol), and with data on the geometry of the three XOH models.…”

Section: (1)mentioning

confidence: 99%

“…Depending on the speed of the modulation the correlaticn function becomes gaussian (slow modulation) or exponentially decaying (fast modulation). Several papers have appeared [12][13][14] in which conclusions are drawn about modulation times and instantaneous distributions, following the above-mentioned assumptions. It should be noted at this time that such an approach will always lead to symmetric bandshapes, whereas in practice asymmetric bandshapes are often encountered.…”

Section: Introductionmentioning

confidence: 99%

Vibrational bandshapes of monohydric saturated alcohols

Dijkman¹

1978

Molecular Physics

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Calculations are presented for three models of alcohols dissolved in carbon tetrachloride in the slow modulation limit. A number of liquidstate models is considered. The calculated bands differ markedly in some cases from the often assumed gaussian distribution. The Raman spectra of the OH-stretching vibration of methanol, t-butanol and adamantanol-1 in dilute CC1, solution are presented. It is concluded that the second moments of these bands compare well with the calculated values in two of the solvent models. The experimental bands are narrower than the computed bands, indicating some motional narrowing. Trends in the vapour-solution frequency shift are also well reproduced in the calculations.

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Vibrational relaxation in liquid methyl iodide.

Cited by 97 publications

References 23 publications

Mechanistic interpretations of vibrational dephasing processes in 1,1,1‐trichloroethane by spontaneous Raman spectroscopy

Mechanistic interpretations of vibrational dephasing processes in 1,1,1‐trichloroethane by spontaneous Raman spectroscopy

Isotropic Raman band shape and vibrational relaxation for molecules in the liquid state: A Critical study of some band shape functions

Vibrational bandshapes of monohydric saturated alcohols

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