Effect of nuclear motion on high-order-harmonic generation of H2+ in intense ultrashort laser pulses

H. Ahmadi, A. Maghari, H. Sabzyan, A. R. Niknam, and M. Vafaee
Phys. Rev. A 90, 043411 – Published 14 October 2014

Abstract

High-order-harmonic generation is investigated for H2+ and D2+ with and without a Born-Oppenheimer approximation by a numerical solution of a full dimensional electronic time-dependent Schrödinger equation under four-cycle intense laser pulses of 800 nm wavelength and I=4, 5, 7, and 10×1014 W/cm2 intensities. For most harmonic orders, the intensity obtained for D2+ is higher than that for H2+, and the yield difference increases as the harmonic order increases. Only at some low harmonic orders, H2+ generates more intense harmonics compared to D2+. The results show that nuclear motion, ionization probability, and system dimensionality must be simultaneously taken into account to properly explain the isotopic effects on high-order-harmonic generation and to justify experimental observations.

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  • Received 22 July 2014
  • Revised 30 August 2014

DOI:https://doi.org/10.1103/PhysRevA.90.043411

©2014 American Physical Society

Authors & Affiliations

H. Ahmadi1, A. Maghari1, H. Sabzyan2, A. R. Niknam3, and M. Vafaee4,*

  • 1Department of Physical Chemistry, School of Chemistry, College of Science, University of Tehran, Tehran, I. R. Iran
  • 2Department of Chemistry, University of Isfahan, Isfahan 81746-73441, I. R. Iran
  • 3Laser and Plasma Research Institute, Shahid Beheshti University, G.C., Tehran, I. R. Iran
  • 4Department of Chemistry, Tarbiat Modares University, P. O. Box 14115-175, Tehran, I. R. Iran

  • *Corresponding author: m.vafaee@modares.ac.ir

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Issue

Vol. 90, Iss. 4 — October 2014

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