Multiphoton ionization and multiphoton resonances in the tunneling regime

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dc.contributor.authorPotvliege, R. M.
dc.contributor.authorMese, E.
dc.contributor.authorVucic, Svetlana
dc.date.accessioned2024-04-24T17:08:38Z
dc.date.available2024-04-24T17:08:38Z
dc.date.issued2010
dc.departmentDicle Üniversitesien_US
dc.description.abstractThe rate of ionization of an atom of helium, argon, or hydrogen exposed to an intense monochromatic laser field and the quasienergy spectrum of their dressed states are studied for values of the Keldysh parameter between 1 and 0.6 and wavelengths between 390 and 1300 nm. The calculations are carried out within the non-Hermitian Floquet theory. Resonances with intermediate excited states significantly affect ionization from the dressed ground state at all the intensities and all the wavelengths considered. The dressed excited states responsible for these structures are large-alpha(0) states akin to the Kramers-Henneberger states of the high-frequency Floquet theory. Within the single-active-electron approximation, these large-alpha(0) states become species independent at sufficiently high intensity or sufficiently long wavelength. Apart for the resonance structures arising from multiphoton coupling with excited states, the ab initio Floquet ionization rate is in excellent agreement with the predictions of two different calculations in the strong field approximation, one based on a length-gauge formulation of this approximation and one based on a velocity-gauge formulation. The calculations also confirm the validity of the omega(2) expansion as an alternative to the strong field approximation for taking into account the nonadiabaticity of the ionization process in intense low-frequency laser fields.en_US
dc.description.sponsorshipTUBITAK [107T308]; Ministry of Science and Technological Development of Serbia [141029A]; EPSRCen_US
dc.description.sponsorshipWe thank Jonathan Parker for detailed information on the time-dependent results shown in Fig. 11 and for useful discussions about the comparison between these results and ours. E.M. thanks TUBITAK for the support provided for this work under the project 107T308. S.V. is supported by the Ministry of Science and Technological Development of Serbia under the project 141029A. Parts of the calculations presented in this article have been performed on computers financed by the EPSRC.en_US
dc.identifier.doi10.1103/PhysRevA.81.053402
dc.identifier.issn1050-2947
dc.identifier.issn1094-1622
dc.identifier.issue5en_US
dc.identifier.urihttps://doi.org/10.1103/PhysRevA.81.053402
dc.identifier.urihttps://hdl.handle.net/11468/17405
dc.identifier.volume81en_US
dc.identifier.wosWOS:000278140000110
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.language.isoenen_US
dc.publisherAmer Physical Socen_US
dc.relation.ispartofPhysical Review Aen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subject[No Keyword]en_US
dc.titleMultiphoton ionization and multiphoton resonances in the tunneling regimeen_US
dc.typeArticleen_US

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