Abstract
The variations in the population densities of Rydberg states (with principal quantum number n ~ 50 — 100) in an expanding ultracold laser plasma (Ne ~ 109 — 104 cm-3, Te ~ 10 — 0.5 K) are calculated. The electron temperature measurement from the population densities of Rydberg states (T C Killian et al., Phys. Rev. Lett., vol. 86, p. 3759, 2001) is shown to be described by the conventional three-body recombination theory with the inclusion of recombination heating of free electrons.
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