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Raman study of ratational diffusion in methyl iodide

โœ Scribed by James E. Griffiths

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
251 KB
Volume
21
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

The usefulness of Roman and NhlR spin relaxation spectroscopic methods in probing the details of molecular motions in liquids is demonstrated in a study of methyl iodide. Analysis of the lineshape of the ~3 Raman band of methyl iodide as a funcrion of temperature yields values of the perpendicular component DL of the diffusion tensor Di and an activation energy of reorientation perpendicuular to the Cx axis of the molecule of 2.1 kcal/mole. Coupling the Rarnan data with 'D NMR spin relaxation data yields values of DY and an activation energy for reorientation about the Ca axis of 0.4 kcal/mole indicating quasi-free rotation for this motion. Thus the reorientational motions of methyl iodide arc shown to be highly anisotropic in the liquid state.

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I'oLmzcd Ram.m studies of rhe ~3~ mode in methyl iodide at 1 and 1600 bar have confmed, through an independent r~wte. the rest&\ prex iousl~ found b> isolopic-dilution studies. By using a cubic-closepacked approximation of the liquid state 2nd \_I I/r0 mlvrxt~on pofcnti.ti for dipolar dcpbasin, '7 b