A simple non-perturbative approach of atom ionisation by intense and ultra-short laser pulses |
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Authors: | G Duchateau E Cormier R Gayet |
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Institution: | (1) CELIA (Centre Lasers Intenses et Applications (UMR 5107 du CNRS).), Université Bordeaux 1, 351 cours de la Libération, 33405 Talence Cedex, France, FR |
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Abstract: | A simple theoretical approach based on Coulomb-Volkov states is introduced to predict ionisation of atoms by intense laser
pulses in cases where the effective interaction time does not exceed one or two optical cycles M. Nisoli et al., Opt. Lett. 22, 522 (1997)]. Under these conditions, the energy distributions of ejected electrons predicted by this non-perturbative approach
are in very good agreement with “exact" results obtained by a full numerical treatment. The agreement is all the better that
the principal quantum number of the initial state is high. For very strong fields, most electrons are ejected at an energy
which is close to the classical kinetic energy that would be transferred to free electrons by the electromagnetic field during
the pulse. The power of the present approach appears when keV. In this region, full numerical treatments become very lengthy and finally do not converge. However, the present Coulomb-Volkov
theory still makes reliable predictions in very short computer times.
Received 19 November 1999 and Received in final form 19 January 2000 |
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Keywords: | PACS 32 80 -t Photon interactions with atoms - 32 80 Fb Photoionization of atoms and ions |
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