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Evidence of two-center interference in high-order harmonic generation from CO2

Anh-Thu Le, X.-M. Tong, and C. D. Lin
Phys. Rev. A 73, 041402(R) – Published 6 April 2006

Abstract

Two recent pump-probe experiments on the high-order harmonic generation (HHG) from partially aligned CO2 molecules have shown that the HHG yields versus the ionization rates as functions of the pump-probe delay time exhibit inverted modulation. The inversion has been attributed to the quantum interference in the recombination process from the two oxygen centers. Using the Lewenstein model to calculate HHG from fixed CO2 molecules and taking into account the partial alignment of the molecules versus the time delay, we interpret that the inversion is due to the degree of overlap between the partially aligned molecules and the angular dependence of the HHG yield. We also note that the harmonic order where inversion occurs may change with probe laser intensity due to the depletion of the ground state.

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  • Received 9 February 2006

DOI:https://doi.org/10.1103/PhysRevA.73.041402

©2006 American Physical Society

Authors & Affiliations

Anh-Thu Le1,*, X.-M. Tong2, and C. D. Lin1

  • 1Department of Physics, Cardwell Hall, Kansas State University, Manhattan, Kansas 66506, USA
  • 2Institute of Materials Science, Graduate School of Pure and Applied Science and Center for Computational Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, Japan

  • *Email address: atle@phys.ksu.edu

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Vol. 73, Iss. 4 — April 2006

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