Laser-assisted XUV double ionization of helium: Energy-sharing dependence of joint angular distributions

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dc.contributor.author Liu, A. H.
dc.contributor.author Thumm, Uwe P. E.
dc.date.accessioned 2016-04-06T15:11:43Z
dc.date.available 2016-04-06T15:11:43Z
dc.date.issued 2015-04-23
dc.identifier.uri http://hdl.handle.net/2097/32459
dc.description Citation: Liu, A. H., & Thumm, U. (2015). Laser-assisted XUV double ionization of helium: Energy-sharing dependence of joint angular distributions. Physical Review A, 91(4), 9. doi:10.1103/PhysRevA.91.043416
dc.description By numerically solving the time-dependent Schrodinger equation in full dimensionality, we discuss the dependance of joint photoelectron angular distributions on the energy sharing of the emitted electrons for the double ionization of helium atoms by ultrashort pulses of extreme ultraviolet (XUV) radiation in coplanar emission geometry with and without the presence of a comparatively weak infrared (IR) laser pulse. For IR-laser-assisted single-XUV-photon double ionization, our joint angular distributions show that the IR-laser field enhances back-to-back electron emission and induces a characteristic splitting in the angular distribution for electrons that are emitted symmetrically relative to the identical linear polarization directions of the XUV and IR pulse. These IR-pulse-induced changes in photoelectron angular distributions are (i) imposed by different symmetry constraints for XUV-pulse-only and laser-assisted XUV double ionization, (ii) robust over a large range of energy sharings between the emitted electrons, and (iii) consistent with the transfer of discrete IR-photon momenta to both photoelectrons from the assisting IR-laser field. While selection-rule forbidden at equal energy sharing, for increasingly unequal energy sharing we find back-to-back emission to become more likely and to compete with symmetric emission.
dc.relation.uri https://doi.org/10.1103/PhysRevA.91.043416
dc.rights This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
dc.rights.uri http://rightsstatements.org/vocab/InC/1.0/
dc.subject Differential Cross-Sections
dc.subject Photo-Double-Ionization
dc.subject Double
dc.subject Photoionization
dc.subject Continuum
dc.subject Electrons
dc.title Laser-assisted XUV double ionization of helium: Energy-sharing dependence of joint angular distributions
dc.type Article
dc.date.published 2015
dc.citation.doi 10.1103/PhysRevA.91.043416
dc.citation.issn 1050-2947
dc.citation.issue 4
dc.citation.jtitle Physical Review A
dc.citation.spage 9
dc.citation.volume 91
dc.contributor.authoreid thumm


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