Two-step excitation of Rb atoms on He nanodroplets |
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Authors: | M Theisen F Lackner F Ancilotto C Callegari W E Ernst |
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Institution: | (1) Department of Chemistry, University of Rome La Sapienza, Piazzale A. Moro 5, 00185 Rome, Italy; |
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Abstract: | We present the first sequential laser excitation of atom-doped helium nanodroplets. Rubidium atoms on the
surface of helium nanodroplets are selectively excited with a continuous wave laser to the 52P1/2
state so as not to desorb from the nanodroplets. From there they are excited by a laser pulse to the 52D
state; a laser-induced fluorescence (LIF) spectrum is recorded by monitoring the
62P ?\rightarrow 52S1/2 emission. The LIF spectrum differs from that of the two-photon one-color
direct excitation spectrum 52D ?\leftarrow 52S1/2, indicating that the system does relax vibrationally
during the lifetime of the 52P1/2 state. To model the LIF spectra we use calculated energy levels of the
Rb atom as a function of its distance R from the center of the helium nanodroplet. The Franck-Condon factors of
the resulting potential energy curves agree with the experimental spectra. In the future the 52P1/2 state
can be used as a springboard to reach high-lying 2S and 2D states, and possibly create an artificial
super-atom. |
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Keywords: | |
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