Elastic Kr*-He collisions have been studied using a two laser saturated-absorption experiment on the λ = 557 nm line of KrI. With the pump laser detuned from the atomic resonance, one can follow the collisional relaxation of Kr* atoms from a non-thermal distribution centred at vz ≠ 0 back towards a thermal distribution.
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Bréchignac et al. (1978) studied this question.
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