Abstract
The sound absorption of H 2S gas has been measured at 298 K in the f/p range from 10 6 to 10 9 Hz/atm using two different types of apparatus. The results exhibit the relaxation of both the vibrational and the rotational heat capacity of the H 2S molecule in two distinct processes. As mean collision numbers per de-excitation we obtained Z vib = 280 and Z rot = 5, numbers which are similar to those valid for the related H 2O molecule. In particular the H 2S molecule also possesses a very large vibrational de-excitation probability.
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