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Fall-back time for photo-ionized Cs atoms attached to superfluid 4He nanodroplets

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Abstract

We have studied the dynamic evolution of a Cs atom photo-excited from 6s to 6p and 7s states on a helium droplet using time-dependent 4He-DFT simulations. Depending on the excited electronic state, the Cs impurity remains on the droplet surface or it is ejected. Upon subsequent photo-ionization of the excited Cs atom the resulting Cs+ cation may either be ejected or come back to the droplet, depending on the time delay between photo-excitation and photo-ionization. We have calculated the critical time delay separating these two different behaviors, as well as final ion velocities. These observables will be used for future comparison with planned pump-probe experiments.

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Correspondence to Martí Pi.

Additional information

Contribution to the Topical Issue “Dynamics of Systems on the Nanoscale (2018)”, edited by Ilko Bald, Ilia A. Solov’yov, Nigel J. Mason and Andrey V. Solov’yov.

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Coppens, F., von Vangerow, J., Leal, A. et al. Fall-back time for photo-ionized Cs atoms attached to superfluid 4He nanodroplets. Eur. Phys. J. D 73, 94 (2019). https://doi.org/10.1140/epjd/e2019-90692-0

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