Faculté des sciences

Rb*Hen exciplexes in solid ⁴He

Hofer, Adrian ; Moroshkin, Peter ; Nettels, Daniel ; Ulzega, Simone ; Weis, Antoine

In: Physical Review A, 2006, vol. 74, p. 032509

We report the observation of emission spectra from Rb*Hen exciplexes in solid ⁴He. Two different excitation channels were experimentally identified, viz., exciplex formation via laser excitation to the atomic 5P3/2 and to the 5P1/2 levels. While the former channel was observed before in liquid helium, on helium nanodroplets, and... Plus

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    Summary
    We report the observation of emission spectra from Rb*Hen exciplexes in solid ⁴He. Two different excitation channels were experimentally identified, viz., exciplex formation via laser excitation to the atomic 5P3/2 and to the 5P1/2 levels. While the former channel was observed before in liquid helium, on helium nanodroplets, and in helium gas by different groups, the latter creation mechanism occurs only in solid helium or in gaseous helium above 10 K. The experimental results are compared to theoretical predictions based on the extension of a model, used earlier by us for the description of Cs*Hen exciplexes. We also report the observation of fluorescence from atomic rubidium in solid helium, and discuss striking differences between the spectroscopic features of Rb-He and Cs-He systems.