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Title: Dynamic nuclear interference structures in the Coulomb explosion spectra of a hydrogen molecule in intense laser fields: Reexamination of molecular enhanced ionization

Abstract

Several theoretical models are used to explain the origin of the recently observed (unexpected) spectral progression in the Coulomb explosion spectra of the hydrogen molecule photoionized by an intense ultrashort laser pulse. In the first ionization step the molecule loses its first electron and then the H{sub 2}{sup +} molecular ion dissociates. Next, at the intermediate stage of the dissociation process, a localized electron state is created from which the second ionization occurs at each laser half-cycle. It is shown that interference between a net-two-photon and a one-photon transition introduces a dynamic structure into the nuclear wave packet corresponding to this localized electron state which leads to the regular spectral progressions seen in the experiment. We confirm these spectral progressions using numerical simulations based on a time-dependent Schroedinger equation describing the exact three-body dynamics of H{sub 2}{sup +} in one dimension.

Authors:
;  [1]; ;  [2]
  1. Laboratoire de Chimie Theorique, Faculte des Sciences, Universite de Sherbrooke, Sherbrooke, Quebec, J1K 2R1 (Canada)
  2. National Research Council, 100 Sussex Drive, Ottawa, Ontario, K1A 0R6 (Canada)
Publication Date:
OSTI Identifier:
21011252
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 76; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevA.76.013405; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; DISSOCIATION; EXPLOSIONS; HYDROGEN; INTERFERENCE; LASER RADIATION; MOLECULAR IONS; MOLECULES; MULTI-PHOTON PROCESSES; NUMERICAL ANALYSIS; PHOTOIONIZATION; PHOTON-MOLECULE COLLISIONS; PHOTONS; PULSES; SCHROEDINGER EQUATION; SIMULATION; SPECTRA; THREE-BODY PROBLEM; TIME DEPENDENCE; WAVE PACKETS

Citation Formats

Chelkowski, Szczepan, Bandrauk, Andre D, Staudte, Andre, and Corkum, Paul B. Dynamic nuclear interference structures in the Coulomb explosion spectra of a hydrogen molecule in intense laser fields: Reexamination of molecular enhanced ionization. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.76.013405.
Chelkowski, Szczepan, Bandrauk, Andre D, Staudte, Andre, & Corkum, Paul B. Dynamic nuclear interference structures in the Coulomb explosion spectra of a hydrogen molecule in intense laser fields: Reexamination of molecular enhanced ionization. United States. https://doi.org/10.1103/PHYSREVA.76.013405
Chelkowski, Szczepan, Bandrauk, Andre D, Staudte, Andre, and Corkum, Paul B. Sun . "Dynamic nuclear interference structures in the Coulomb explosion spectra of a hydrogen molecule in intense laser fields: Reexamination of molecular enhanced ionization". United States. https://doi.org/10.1103/PHYSREVA.76.013405.
@article{osti_21011252,
title = {Dynamic nuclear interference structures in the Coulomb explosion spectra of a hydrogen molecule in intense laser fields: Reexamination of molecular enhanced ionization},
author = {Chelkowski, Szczepan and Bandrauk, Andre D and Staudte, Andre and Corkum, Paul B},
abstractNote = {Several theoretical models are used to explain the origin of the recently observed (unexpected) spectral progression in the Coulomb explosion spectra of the hydrogen molecule photoionized by an intense ultrashort laser pulse. In the first ionization step the molecule loses its first electron and then the H{sub 2}{sup +} molecular ion dissociates. Next, at the intermediate stage of the dissociation process, a localized electron state is created from which the second ionization occurs at each laser half-cycle. It is shown that interference between a net-two-photon and a one-photon transition introduces a dynamic structure into the nuclear wave packet corresponding to this localized electron state which leads to the regular spectral progressions seen in the experiment. We confirm these spectral progressions using numerical simulations based on a time-dependent Schroedinger equation describing the exact three-body dynamics of H{sub 2}{sup +} in one dimension.},
doi = {10.1103/PHYSREVA.76.013405},
url = {https://www.osti.gov/biblio/21011252}, journal = {Physical Review. A},
issn = {1050-2947},
number = 1,
volume = 76,
place = {United States},
year = {2007},
month = {7}
}