Ionization of a hydrogen atom from its ground state by a coherent bichromatic laser field |
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| Authors: | M Fifirig A Cionga |
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| Institution: | (1) Department of Chemistry, University of Bucharest, Bd. Regina Elisabeta 4-12, Bucharest 70346, Romania, RO;(2) Institute of Space Sciences, P.O. Box MG-36, Bucharest-Magurele 76900, Romania, RO |
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| Abstract: | We study the “coherent phase control” between the three-photon ionization by a fundamental laser field and the one-photon
ionization by its third harmonic for a hydrogen atom in its ground state. The relative phase δ of the harmonic field with
respect to the fundamental laser radiation “modulates” the interference between the two ionization channels, which is important
near the crossing points between the ionization rates of the two individual processes. Numerical results for the total ionization
rate and for the angular distribution of the photoelectrons as a function of the phase δ are presented for frequencies located
in the vicinity of the atomic resonances corresponding to the absorption of two laser photons.
Received 31 August 2000 and Received in final form 6 February 2001 |
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| Keywords: | PACS 32 80 Rm Multiphoton ionization and excitation to highly excited states (e g Rydberg states) – 32 80 Fb Photoionization of atoms and ions |
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