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Published in

IOP Publishing, Journal of Physics Communications, 5(4), p. 055012, 2020

DOI: 10.1088/2399-6528/ab6175

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Strong-field-induced single and double ionization dynamics from single and double excitations in a two-electron atom

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Abstract Two-electron dynamics of an excited model atom interacting with moderately strong laser fields is analyzed in the time domain. We solve the time-dependent Schrödinger equation (TDSE) for two electrons confined to the same one-dimensional configuration space, accounting also for the electron-electron interaction. The computational method allows direct access to the time-dependent population of the relevant atomic states during and right after the interaction with a near-infrared (NIR) laser pulse. We compare the ionization dynamics of singly excited states and doubly excited states. We find that doubly-excited initial states exhibit enhanced double ionization yield, with non-trivial dynamics including contributions from direct and sequential processes, while the electrons leave the atom either back-to-back or in the same direction.