Isotropic Raman line widths in binary mixtures of van der Waals liquids : a comparison between isotopically and chemically diluted states of liquid methyl iodide

To analyze vibrational depopulation and dephasing mechanisms of polyatomic liquids, the presently most comprehensive study on the dilution behavior of isotropic Raman line widths has been made. By way of example, and following early proposals of Evans and Yarwood [Adv. Mol. Relaxation Int. Processes 21, 1 (1981)], liquid methyl iodide (MeI) was chosen. The low temperature study (T=207 K) covers the detailed concentration dependencies (x) of the isotropic half‐widths (FWHH) in total 17 (of 18 possible) polarized fundamentals of CH3I and in the isotopically modified molecules CH2DI, CHD2I, and CD3I (12CD3I) (i) in chemical mixtures with xenon and (partially) CF3I and (ii) in all the six binary isotopic mixtures of the isotopic species above. Furthermore, isotopic and chemical dilutions are combined in ternary mixtures of type (CX3I)0.014−(CY3I)x−0.014−Z1−x with X, Y=H, D and Z=Xe, CF3I, where the trace CX3I has been investigated to study the modulations of the vibrational transition frequency by changes of ...

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