Unusual Rydberg System Consisting of a Positively Charged Helium Nanodroplet with an Orbiting Electron

Evidence is presented of an unusual Rydberg system consisting of a helium nanodroplet containing a positively charged sodium ion and an orbiting electron. Rydberg states of this system with principal quantum number n<20 are found to be unstable on a nanosecond timescale. In contrast, Rydberg states with n≳100 are found to have a lifetime of 1.1 s. In addition, it is found that the ionization threshold of sodium doped helium is broadened and red-shifted with respect to that of the free atom. These observations are successfully reproduced using a pseudo-diatomic description of the system in which the interactions of the sodium and its ion with the helium are calculated as the sum of pair potentials.


Published in:
Physical Review Letters, 106, 083401
Year:
2011
Publisher:
American Physical Society
ISSN:
0031-9007
Keywords:
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 Record created 2011-01-18, last modified 2018-03-17

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