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Laser Physics

, 19:1559 | Cite as

Electron wavepacket phases in ionization and rescattering processes by intense laser pulses

  • A. D. Bandrauk
  • J. Manz
  • K. -J. Yuan
Rescattering

Abstract

Exact numerical solutions of the time-dependent Schrödinger equation, TDSE, are presented for the H atom and H2/+ molecular ion ionized by short (10 optical cycles), intense I 0 ≥ 1014 W/cm2, 800 nm laser pulses. Calculations of the time dependent expectation values of the dipole moment d(t), velocity \( \dot d \)(t), and acceleration \( \ddot d \)(t) are used to identify the phase of these physical parameters with respect to the laser field during the harmonic generation process. It is found in general that electron wavepackets in an inner region near the parent ion are out of phase with the response expected from the classical laser induced recollision model, whereas wavepackets in an outer region, far from the parent ion, are in phase with the field force. It is found furthermore that it is the inner electron wavepacket which contributes mainly to the high order harmonic generation, HHG, process, even though its acceleration is out of phase with the field force. This suggests strong Coulomb refocussing effects in the HHG process, especially in the case of H2/+.

PACS numbers

32.80.Wz 33.80.Wr 

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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  1. 1.Laboratoire de Chimie Théorique, Faculté des SciencesUniversité de SherbrookeSherbrookeCanada
  2. 2.Institut für Chemie und BiochemieFreie Universität BerlinBerlinGermany

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