Multiple Velocity Dispersion in Normal Hydrogen and in Normal Hydrogen-Helium Mixtures

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Abstract
Velocity dispersion in normal hydrogen and in normal hydrogen-helium mixtures has been investigated at room temperature using an ultrasonic interferometer. Double relaxation theory is in remarkably good agreement with the experimental results. Single-relaxation theory is definitely not in accord with experiment. The relaxation time for the 1–3 transitions is found to be 2.26 × 10−8 sec for hydrogen-hydrogen collisions and 4.39 × 10−8 sec for helium-hydrogen collisions. The respective collision numbers are 321 and 439. The relaxation time increased with increasing energy of transition. Helium-hydrogen collisions appear to be more effective than hydrogen-hydrogen collisions for the 0–2 transitions but not for the higher-energy transitions.

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