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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.

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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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  • DOI: https://doi.org/10.1140/epjd/e2019-90692-0

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