Two-Step Excitation of rb and cs Atoms on he Nanodroplets

Details Two-Step Excitation of rb and cs Atoms on he Nanodroplets Two-Step Excitation of rb and cs Atoms on he Nanodroplets

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confetg03t&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

Physics

Electronic (Uv/Vis/Nir)

Scientific paper

We present the first sequential excitation of atom-doped helium nanodroplets. Rubidium atoms on the surface of a helium nanodroplet are selectively excited to the 5^2P1/2 state so as not to desorb from the droplet. From there they are excited by a laser pulse to the 5^2D state; a laser-induced fluorescence (LIF) spectrum is recorded by monitoring the 62P→52S1/2 emission. We find some difference in the LIF spectrum as compared to that of the two-photon one-color direct excitation spectrum 5^2D←5^2S1/2. This indicates that the system does relax vibrationally during the lifetime of the 5^2P1/2 state. To model the LIF spectra we calculate the energy levels of the Rb atom as a function of its distance R from the center of the droplet. The Franck-Condon factors of the resulting potential energy curves agree with the experimental findings. A similar behavior has been found for cesium. New measurements predict that it also stays bound on the surface of the droplet in its 6^2P1/2 state. From there we further excited Cs monomers into their 6^2D state, where also the LIF spectrum is recorded by watching the 72P→62S1/2 emission. In the future these states can be used as a springboard to reach high-lying 2S and 2D states, and possibly create an artificial super-atom.
G. Auböck, J. Nagl, C. Callegari, and W. E. Ernst, Phys. Rev. Lett. 101, 035301 (2008)
F. Ancilotto, M. Pi, R. Mayol, M. Barranco, and K. Lehmann, J. Phys. Chem. A 111, 12695-12701 (2007)

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