Reorientational and angular momentum correlation times in gaseous tetrafluoromethane at moderate densities

1973 ◽  
Vol 59 (8) ◽  
pp. 4151-4156 ◽  
Author(s):  
J. H. Campbell ◽  
S. J. Seymour ◽  
J. Jonas
Keyword(s):  
Angular Momentum ◽  
Correlation Times ◽  
Momentum Correlation

Molecular beam kinetics: Angle‐angular momentum correlation in reactive scattering

1974 ◽  
Vol 61 (11) ◽  
pp. 4927-4928 ◽  
Author(s):  
D. S. Y. Hsu ◽  
G. M. McClelland ◽  
D. R. Herschbach
Keyword(s):  
Angular Momentum ◽  
Molecular Beam ◽  
Reactive Scattering ◽  
Momentum Correlation

Raman spectral studies of molecular reorientation in liquid tetramethylsilane

1976 ◽  
Vol 54 (2) ◽  
pp. 211-216 ◽  
Author(s):  
S. Sunder ◽  
R. E. D. McClung
Keyword(s):  
Fourier Transforms ◽  
Rotational Diffusion ◽  
Spectral Studies ◽  
Diffusion Limit ◽  
Nuclear Relaxation ◽  
Molecular Reorientation ◽  
Correlation Times ◽  
Momentum Correlation ◽  
Relaxation Study ◽  
Raman Spectral

The contours of five Raman bands of liquid tetramethylsilane have been studied over the temperature range 178–350 K. Two bands were further analyzed to obtain the reorientational and angular momentum correlation times by removing the contributions from nonreorientational broadening and comparing the corrected Fourier transforms of the bands with the reorientational correlation functions calculated using the J diffusion limit of the extended rotational diffusion model. The agreement between the correlation times obtained from the analysis of the two Raman bands and those obtained from the nuclear relaxation study of liquid tetramethylsilane is satisfactory.

Analyse comparative à densité variable du profil de la bande ν3 de CH4 dans SF6, Ar et CCL4

1979 ◽  
Vol 57 (4) ◽  
pp. 564-571 ◽  
Author(s):  
J. Vincent-Geisse ◽  
J. Soussen-Jacob ◽  
T. Nguyen Tan ◽  
R. E. D. McClung
Keyword(s):  
High Pressure ◽  
Angular Momentum ◽  
Collision Frequency ◽  
Rotational Diffusion ◽  
Mean Square ◽  
Infrared Band ◽  
Liquid Solutions ◽  
Momentum Correlation ◽  
The Mean ◽  
Analyse Comparative

The ν3 infrared band of CH4 has been measured in liquid solutions in SF6 and CCl4 at several temperatures, and in high pressure gas mixtures with Ar at several pressures. The band profiles were compared with those computed using the semi-classical extended rotational diffusion models for molecular rotation in fluids, and values of the angular momentum correlation time, τ, determined. The density and temperature dependence of τ was in accord with the interpretation of τ−1 as a collision frequency. The mean square torques were obtained from the fourth moments of spectral contours.

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