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The mean free paths and effective collision cross sections of neutral atoms of Li, Na, K, Rb and Cs were measured in H₂, D₂, He, Ne and A by the method of molecular beams. The beams were sufficiently narrow and the scattering gas was confined to a region sufficiently small that a resolution of one minute of arc was attained. The results show a larger collision cross section in D₂ than in H₂ for all the alkalis with the exception of Li. This effect is interpreted as a consequence of the smaller spacing of the D₂ rotational levels. The results in general are in qualitative agreement with the quantum theory of collisions.
Rosin et al. (Thu,) studied this question.