Closure approximation in the theory of two-photon double ionization of atoms

We consider two-photon double ionization of helium with 100, 200, and 400 eV excess energy. We focus on the case of ultrashort pulses and develop an approach to calculate the two-photon transition matrix elements within the lowest order of the time-dependent perturbation theory. It is shown, that in...

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Published inJournal of physics. Conference series Vol. 388; no. 3; pp. 32004 - 1
Main Authors Chuluunbaatar, O, Bachau, H, Popov, Yu V, Piraux, B
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.01.2012
Subjects
Approximation
Closures
Green's functions
Helium
Ionization
Mathematical analysis
Perturbation theory
Photons
Physics
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Summary:We consider two-photon double ionization of helium with 100, 200, and 400 eV excess energy. We focus on the case of ultrashort pulses and develop an approach to calculate the two-photon transition matrix elements within the lowest order of the time-dependent perturbation theory. It is shown, that in the subfemtosecond regime the intermediate Green's function can be successfully evaluated by means of the closure approximation.
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ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/388/3/032004