Spin-Lattice Relaxation in Dilute Gases. II. 19F Relaxation in CF4 and SiF4

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Abstract
Fluorine spin‐lattice relaxation times have been measured in gaseous CF4 and SiF4 as a function of temperature and pressure in the dilute gas region. The observed temperature dependence is consistent with that expected for relaxation dominated by a spin‐rotation interaction. Effective cross sections for the transfer of angular momentum to molecular rotation during collisions are deduced. It is found that between one and three binary collisions are sufficient to randomize the molecular rotational angular momentum of these molecules in the temperature range studied.