Self-broadenings and frequency shifts of n²S and n²D Rydberg levels (up to n~70) have been measured for rubidium in the pressure range of 3 to 100 mTorr, and the general dependence on principal quantum number n has been established for this low-pressure regime. A closer examination has revealed large (almost evenly spaced) oscillations in the dependence of linewidth on principal quantum number for the ²S levels in the region of largest linewidth (n~20 to 30).
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Stoicheff et al. (1980) studied this question.
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