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

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DOIResolve DOI: http://doi.org/10.1103/PhysRevA.76.013405
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TypeArticle
Journal titlePhysical Review A: Atomic, Molecular, and Optical Physics
Volume76
Issue1
Article number013405
Pages116; # of pages: 16
Subjecthigh-speed optical techniques; hydrogen neutral molecules; molecular electronic states; molecule-photon collisions; numerical analysis; photodissociation; photoionisation; Schrodinger equation; two-photon processes
AbstractSeveral 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 H₂⁺ 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 Schrödinger equation describing the exact three-body dynamics of H₂+ in one dimension.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedYes
NPARC number12327944
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Record identifierfe4d05be-f0cc-4c45-b25c-414a91fc3b90
Record created2009-09-10
Record modified2016-05-09
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