Effects due to the interaction of 300 K background radiation with Xe(nf) Rydberg atoms are reported. Transitions to nearby d and g levels are observed. When the ambient photon density is reduced to that appropriate to liquid-nitrogen temperature by cooling the apparatus, a corresponding reduction in the transition rates to these levels is observed. The transition rates are found to be consistent with those predicted by use of quantum-defect theory.
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Hildebrandt et al. (1981) studied this question.
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