Absorption Line-Narrowing Experiment between Atoms of Two Different Species

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Abstract
An experiment analogous to a three-level absorption line-narrowing experiment is performed between atoms of two different species (krypton and xenon) connected by a resonant excitation transfer. Results show that the hole burned in the velocity distribution of krypton atoms is transferred to xenon ones. This effect is interpreted by introducing a cross-collision kernel. Analysis of the experimental line shapes is consistent with a Gaussian shape of this kernel, whose width is found to be pressure independent.