Imaging ring-current wave packets in the helium atom

Venzke, J.; Becker, A.; Jaron-Becker, A.

doi:10.1103/physreva.103.042808

Title: Imaging ring-current wave packets in the helium atom

Journal Article · Mon Apr 05 00:00:00 EDT 2021 · Physical Review A

DOI:https://doi.org/10.1103/physreva.103.042808· OSTI ID:1850752

^[1]; Becker, A. ^[1]; Jaron-Becker, A. ^[1]

Univ. of Colorado, Boulder, CO (United States)

We study the reconstruction of a wave packet and the corresponding electron dynamics in an atom via photoelectron angular distributions (PADs) in a pump-probe scheme as a function of time delay. The method is applied to the superposition of ground and one or two excited states in helium atom representing field-free charge migrations on the attosecond timescale in form of ring currents around the core. It is based on the interference between one- and two-photon transitions from ground and excited states into the continuum. In the reconstruction predictions of first- and second-order perturbation theory are used to determine the unknown phases and amplitudes from the PADs, which we simulate via solutions of the time-dependent Schrödinger equation in single-active-electron approximation. Results of calculations show that the reconstruction technique works well for peak laser intensities less than 1013 W/cm2. Knowledge of the electric field of the probe pulse is required with shot-to-shot variations of carrier-to-envelope phase and peak intensity of up to 10% and 20%, respectively. The relevance of different one- and two-photon pathways for the reconstruction as a function of peak intensity and pulse duration is analyzed—specifically their role for ultrashort probe pulses with broad bandwidths.

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Research Organization:: Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0001771

OSTI ID:: 1850752

Alternate ID(s):: OSTI ID: 1874534

Journal Information:: Physical Review A, Vol. 103, Issue 4; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Imaging ring-current wave packets in the helium atom

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