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- Title
Two-step excitation of Rb atoms on He nanodroplets.
- Authors
Theisen, M.; Lackner, F.; Ancilotto, F.; Callegari, C.; Ernst, W. E.
- 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 5P state so as not to desorb from the nanodroplets. From there they are excited by a laser pulse to the 5D state; a laser-induced fluorescence (LIF) spectrum is recorded by monitoring the 6P $\rightarrow$ 5S emission. The LIF spectrum differs from that of the two-photon one-color direct excitation spectrum 5D $\leftarrow$ 5S, indicating that the system does relax vibrationally during the lifetime of the 5P 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 5P state can be used as a springboard to reach high-lying S and D states, and possibly create an artificial super-atom.
- Subjects
ELECTRONIC excitation; RUBIDIUM; NANOSTRUCTURED materials; HELIUM; SURFACES (Technology); FRANCK-Condon principle; POTENTIAL energy surfaces; FIELD emission
- Publication
European Physical Journal D (EPJ D), 2011, Vol 61, Issue 2, p403
- ISSN
1434-6060
- Publication type
Article
- DOI
10.1140/epjd/e2010-10504-5