Multiphoton processes in an intense laser field. VI. Two-color ionization with incommensurable frequencies
- Department of Physics, University of Southern California, Los Angeles, California 90089-0484 (USA)
- Physics Department, University of Durham, Durham DH13LE, England (GB)
We present results of Floquet calculations of rates and yields for ionization of atomic hydrogen, in its ground state, in the presence of a relatively weak high-frequency field and a relatively strong low-frequency (1064-nm) field. We assume that the two frequencies are incommensurable, or, if they are not, we average over the relative phase. We explore three processes: (i) Resonance-enhanced ionization, via levels that are ac-Stark mixed or/and very strongly shifted, (ii) laser-induced continuum structure, and (iii) nonresonant ionization in a regime where, despite the fact that the infrared field significantly shifts the ground state relative to the continuum, it only redistributes the photoelectrons over the low-frequency channels. We also illustrate the sensitivity of the ionization yield to the spatiotemporal configuration of the two fields.
- OSTI ID:
- 5665529
- Journal Information:
- Physical Review, A; (United States), Vol. 44:1; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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