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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 9 — Apr. 26, 2010
  • pp: 8976–8989

Momentum space analysis of multiphoton double ionization of helium by intense attosecond xuv pulses

Zheng Zhang, Liang-You Peng, Qihuang Gong, and Toru Morishita  »View Author Affiliations


Optics Express, Vol. 18, Issue 9, pp. 8976-8989 (2010)
http://dx.doi.org/10.1364/OE.18.008976


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Abstract

We investigate the momentum and energy distributions of the two electrons in multiphoton double ionization of He by intense attosecond xuv pulses, based on a two-dimensional model. Two different patterns of the momentum distributions are identified, corresponding to the uncorrelated and correlated channels, respectively. Our analysis of the electron correlations focuses on two-photon and three-photon double ionization processes for different pulse durations and for different time delays after the pulses. For both two-photon and three-photon cases, a clear correlation valley in energy distributions is found when both electrons are ejected in opposite directions. This is mostly attributed to the electron correlations during the ionization of the first electron. We also find that when two electrons are ejected in the same direction, their Coulomb repulsion has an significant influence on the electron energy distributions during the postionization stage. Finally, in the case of three photon double ionization, we observe that the effects of the Coulomb repulsion become much more complicated, and a new catch-up collision phenomena is observed in the energy distributions.

© 2010 Optical Society of America

OCIS Codes
(020.4180) Atomic and molecular physics : Multiphoton processes
(260.3230) Physical optics : Ionization
(020.2649) Atomic and molecular physics : Strong field laser physics

ToC Category:
Atomic and Molecular Physics

History
Original Manuscript: March 2, 2010
Revised Manuscript: April 8, 2010
Manuscript Accepted: April 8, 2010
Published: April 14, 2010

Citation
Zheng Zhang, Liang-You Peng, Qihuang Gong, and Toru Morishita, "Momentum space analysis of multiphoton double ionization of helium by intense attosecond xuv pulses," Opt. Express 18, 8976-8989 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-9-8976


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