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

I A Ivanov1 and A S Kheifets

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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.


PACS

32.80.Rm Multiphoton ionization and excitation to highly excited states

Subjects

Atomic and molecular physics

Dates

Issue 13 (14 July 2005)

Received 11 March 2005, in final form 21 April 2005

Published 14 June 2005



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