Intramolecular vibrational energy acetylene

It has been found that IVR is in the statistical limit for a series of molecules with the general formula (0X3)37—C C—H, where 7 is C or Si and X is H, D, or F (Kerstel et al., 1991 Gambogi et al., 1993). The initially excited state is a fundamental or first overtone of the acetylenic C—H stretch. The spectra for the R 1) transitions of the fundamentals and the R 5) transitions of the overtones for 3,3-dimethylbutane, (CH3)3CC=CH, and (trimethylsilyl) acetylene (CH3)3SiC CH are shown in figure 4.16. The solid lines are Lorentzian fits, Eq. (4.34), to the spectra. In the statistical limit of intramolecular vibrational energy redistribution a Lorentzian line shape is... 

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