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(2 gamma,2e) total and differential cross-section calculations for helium with (h)over-bar omega=40-50 eV

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Foumouo, Emmanuel [UCL] Bachau, H. [CELIA, Université de Bordeaux, France] Piraux, Bernard [UCL]

We consider two-photon double ionization of helium and analyse the electron dynamics in the region where the process is direct (39.49 eV < <(h)over bar>omega < 54.42 eV). The fundamental process of two-photon double ionization (TPDI) is far from being well understood. In order to gain physical insight into the dynamics involved in TPDI, we investigate the electron energy distributions for <(h)over bar>omega = 46 eV and (h) over bar omega = 50 eV, angular distributions are also analysed. The theoretical approach is based on the resolution of the time-dependent Schrodinger equation (TDSE), using a spectral approach. At the end of the pulse the TPDI probability is extracted from the total wavefunction using two different approaches. The first one neglects the electron interaction in the double continuum while the second one includes electron correlation effects. At (h) over bar omega approximate to 45 eV the electrons are preferably emitted back-to-back with equal energy. At (h) over bar omega = 50 eV the excess energy is likely to be transfered to one of the electron, while the electrons are emitted in opposite or same directions.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2009
Language Anglais
Journal information "The European Physical Journal. Special Topics" - Vol. 175, p. 175-180 (2009)
Peer reviewed yes
Publisher Edp Sciences S A (Les Ulis Cedex A)
issn 1951-6355
e-issn 1951-6401
Publication status Publié
Affiliation UCL - SC/PHYS - Département de physique
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Bibliographic reference Foumouo, Emmanuel ; Bachau, H. ; Piraux, Bernard. (2 gamma,2e) total and differential cross-section calculations for helium with (h)over-bar omega=40-50 eV. In: The European Physical Journal. Special Topics, Vol. 175, p. 175-180 (2009)
Permanent URL http://hdl.handle.net/2078.1/35367