Abstract
Measurements of the time-resolved fluorescence from some highly excited states of 133Cs atoms (n2D3/2, n2D5/2 and n2S1/2(n-4)2F; n=9 to 15) have shown multi-exponential behaviour which depends on vapour pressure. This behaviour is the result of mixing of population caused by collisions between the excited and ground-state atoms. The variation of the exponential rate constants with vapour density yields the free-atom lifetimes and collisional transfer cross sections of these excited states. An analogy is drawn between this variation and that of the energy eigenvalues of an atom under external perturbation.
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