Pulse-width and isotope effects in femtosecond-pulse strong-field dissociation of H2+ and D2+

C. Trump, H. Rottke, M. Wittmann, G. Korn, W. Sandner, M. Lein, and V. Engel
Phys. Rev. A 62, 063402 – Published 30 October 2000
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Abstract

Using a high-resolution setup, we investigate the fragmentation of H2 and D2 in intense 790 nm laser pulses with pulse widths of 28 fs and 80 fs. The measured H+ (D+) kinetic energies resulting from effective two-photon dissociation of H2+ (D2+) show a clear dependence on the pulse width and on the isotope. One-dimensional calculations reproduce these effects and show that they mainly originate from the H2+ (D2+) dissociation dynamics. Further, we find that the initial ionic state before dissociation is not simply given as a Franck-Condon distribution over unperturbed ionic states. Rather it is a complex mixture of initial wave packets (covering, however, a small energy range) created by multiphoton ionization of H2 and D2 at various times during the action of the pulse.

  • Received 29 March 2000

DOI:https://doi.org/10.1103/PhysRevA.62.063402

©2000 American Physical Society

Authors & Affiliations

C. Trump1, H. Rottke1, M. Wittmann1, G. Korn1, W. Sandner1,2, M. Lein3,4, and V. Engel3

  • 1Max-Born-Institut, Max-Born-Straße 2a, D-12489 Berlin, Germany
  • 2Technische Universität Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany
  • 3Institut für Physikalische Chemie, Am Hubland, D-97074 Würzburg, Germany
  • 4Institut für Theoretische Physik, Am Hubland, D-97074 Würzburg, Germany

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Vol. 62, Iss. 6 — December 2000

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