Impact of two-electron dynamics and correlations on high-order-harmonic generation in He

Anton N. Artemyev, Lorenz S. Cederbaum, and Philipp V. Demekhin
Phys. Rev. A 95, 033402 – Published 3 March 2017

Abstract

The interaction of a helium atom with an intense, short, 800-nm, laser pulse is studied theoretically beyond the single-active-electron approximation. For this purpose, the time-dependent Schrödinger equation for a two-electron wave packet driven by a linearly polarized infrared pulse is solved by the time-dependent restricted-active-space configuration-interaction method in the dipole velocity gauge. By systematically extending the space of active configurations, we investigate the role of the collective two-electron dynamics in the strong-field ionization and high-order-harmonic generation processes. Our numerical results demonstrate that allowing both electrons in He to be dynamically active results in a considerable extension of the computed high-order-harmonic generation spectrum.

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  • Received 12 January 2017

DOI:https://doi.org/10.1103/PhysRevA.95.033402

©2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Anton N. Artemyev1, Lorenz S. Cederbaum2, and Philipp V. Demekhin1,3,*

  • 1Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
  • 2Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
  • 3Research Institute of Physics, Southern Federal University, Stachki av. 194, 344090 Rostov-on-Don, Russia

  • *demekhin@physik.uni-kassel.de

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Issue

Vol. 95, Iss. 3 — March 2017

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