Enhanced multiple-scattering and intra-half-cycle interferences in the photoelectron angular distributions of atoms ionized in midinfrared laser fields

Xiao-Min Tong, Predrag Ranitovic, Daniel D. Hickstein, Margaret M. Murnane, Henry C. Kapteyn, and Nobuyuki Toshima
Phys. Rev. A 88, 013410 – Published 15 July 2013

Abstract

We investigate the physical mechanisms responsible for fine structure in the photoelectron angular distributions from atoms subject to intense midinfrared laser fields by solving the time-dependent Schrödinger equation in the integral form. By restricting the ionization to a half cycle of the laser field and then propagating the liberated electron wave packet during the laser pulse, we show conclusively that low-energy-momenta structure in the photoelectron angular distribution originates from multiple scatterings of the tunnel-ionized electron with the ion. We also show that two conditions must be satisfied simultaneously in order to observe prominent low-energy features. First, multiple scattering of the tunnel-ionized electron wave packet is necessary. Second, tunnel ionization must dominate over multiphoton ionization. While the first condition is generally satisfied for all laser wavelengths, the second condition is satisfied only for longer laser wavelengths.

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  • Received 28 January 2013

DOI:https://doi.org/10.1103/PhysRevA.88.013410

©2013 American Physical Society

Authors & Affiliations

Xiao-Min Tong1,2,*, Predrag Ranitovic3,4, Daniel D. Hickstein3, Margaret M. Murnane3, Henry C. Kapteyn3, and Nobuyuki Toshima1

  • 1Division of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
  • 2Center for Computational Sciences, University of Tsukuba,1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan
  • 3JILA and Department of Physics, University of Colorado at Boulder, Boulder, Colorado 80309, USA
  • 4Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA

  • *tong.xiaomin.ga@u.tsukuba.ac.jp

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Vol. 88, Iss. 1 — July 2013

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