The collision-induced transition j=2→0 in ortho-D2 has been observed using a direct kinematic technique. A velocity-selected atomic beam of K was crossed with a cooled, modulated beam of o-D2 molecules. Velocity analysis of the K beam scattered through known center-of-mass angles (near 110°) gave direct evidence of recoil arising from inelastic collisions in which the rotational de-excitation j=2→0 had occurred.
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Blythe et al. (1964) studied this question.
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