Crossed-Beam Determination of Na—Rare-Gas Fine-Structure-State—Changing Cross Sections

Abstract
We report first measurements of the velocity dependence of an alkali-rare-gas fine-structure-state-changing collision with adequate range and resolution to reveal a peak in the cross section. The method uses crossed atomic beams and selective laser excitation. Results are presented for Na colliding with Ne, Ar, and Kr. The results for Na-Ar are in good agreement with theory, while those for Na-Ne and Na-Kr are in serious disagreement.