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On the use of the Kramers–Henneberger Hamiltonian in multi-photon ionization calculations

I A Ivanov et al 2005 J. Phys. B: At. Mol. Opt. Phys. 38 2245-2255   doi: 10.1088/0953-4075/38/13/016  Help

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I A Ivanov1 and A S Kheifets
Research School of Physical Sciences and Engineering, The Australian National University, Canberra ACT 0200, Australia
1 On leave from the Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Russia
E-mail: Igor.Ivanov@.anu.edu.au

Abstract. We employ the Kramers–Henneberger Hamiltonian for time-independent calculations of two-photon ionization of atoms with one and two electrons. As compared to the electromagnetic interaction in the length and velocity gauges, the presently employed Kramers–Henneberger gauge has an advantage of the dipole matrix elements for the free–free electron transitions being finite and well-defined quantities. This circumstance simplifies considerably the computations and allows us to obtain accurate results for the two-photon ionization of realistic atomic systems.

Print publication: Issue 13 (14 July 2005)
Received 11 March 2005, in final form 21 April 2005
Published 14 June 2005

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