Abstract
The impact broadening and shift of RbnS andnD levels by the noble gases He, Ar and Xe have been measured by Doppler-free two-photon absorption from the 5S ground state in a thermionic diode up to high principal quantum numbers. The dependence of the broadening rates onn was found to be in qualitative agreement with theoretical data. While the broadening and shift rates of the RbnS andnD levels due to collisions with He or Ar show only slightly different dependences along the series, the corresponding Rb-Xe data present strong differences indicating large contributions by inelastic collisions. For largen the broadening data were found to be independent of the principal quantum number and the angular momentuml. The measured constant values cannot be explained by taking only into account the polarisation contribution. It was found to be a factor of 1.5 to 2 larger than the corresponding theoretical predictions. The shift rates aren-andl-independent and in satisfactory agreement with theoretical values for large principal quantum numbers.
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We thank Dr. M. Hugon of Saclay for providing us with the depopulation cross sections of RbnS andnD states by noble gases prior to publication. Financial support from the Deutsche Forschungsgemeinschaft is gratefully acknowledged.
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Weber, K.H., Niemax, K. Impact broadening and shift of RbnS andnD levels by noble gases. Z Physik A 307, 13–24 (1982). https://doi.org/10.1007/BF01416067
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DOI: https://doi.org/10.1007/BF01416067