Two-colour multiphoton ionization of hydrogen by an intense laser field and one of its harmonics

New results of ab initio Floquet calculations of rates for multiphoton ionization of atomic hydrogen by a coherent superposition of an intense laser field and one of its harmonics (second, third, fifth or seventh) are presented. The authors discuss further the relationship of these processes with two-colour ionization by fields with incommensurable frequencies, as well as the range of validity of Perelomov and Popov's formula (1967).

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