I A Ivanov and A S Kheifets 2008 J. Phys. B: At. Mol. Opt. Phys. 41 095002 doi:10.1088/0953-4075/41/9/095002
I A Ivanov1 and A S Kheifets1
Show affiliationsWe report the total integrated cross-section (TICS) of two-photon double ionization of helium in the photon energy range from 40 to 54 eV. We compute the TICS in the lowest order perturbation theory (LOPT) using the length and Kramers–Henneberger gauges of the electromagnetic interaction. Our findings indicate that the LOPT gives results for the TICS in agreement with our earlier non-perturbative calculations.
32.80.Rm Multiphoton ionization and excitation to highly excited states
Issue 9 (14 May 2008)
Received 9 January 2008, in final form 26 March 2008
Published 22 April 2008
I A Ivanov and A S Kheifets 2008 J. Phys. B: At. Mol. Opt. Phys. 41 095002
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