Resonant above-threshold ionization of atomic hydrogen

Journal Article · Sat Aug 01 04:00:00 EDT 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.46.1488· OSTI ID:7034937

Gontier, Y; Trahin, M ^[1]

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1. Service des Photons, Atomes et Molecules, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette CEDEX (France)

An all-order multiphoton resonant theory for above-threshold ionization is presented within the resolvent formalism. An analytical expression displaying all the contributions to the electron yield is discussed. The theory is applied to the calculation of photoelectron energy spectra for ionization of H by picosecond and subpicosecond pulses of linearly polarized light at 608 nm, with laser intensities in the range 10{sup 13}--10{sup 14} W/cm{sup 2}. The role of intensity, interaction time, and transition couplings, in the resonantly enhanced electron yield coming from each ({ital nl}) intermediate state, is discussed. The modifications which affect the shape of the spectrum as the laser peak intensity increases are described in great detail. An inversion of the relative amplitudes of the resonant structures is observed. This effect is attributed to the relative dimensions of the effective interaction volumes in which the field reaches sufficient intensities to give rise to the resonances. Our results reproduce the main features of recently measured spectra (H. Rottke {ital et} {ital al}., Phys. Rev. Lett. 64, 404 (1990)).

• OSTI ID: 7034937
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 46:3; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
COLLISIONS
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY
ENERGY SPECTRA
HYDROGEN
IONIZATION
LASERS
MULTI-PHOTON PROCESSES
NONMETALS
PHOTOIONIZATION
PHOTON COLLISIONS
PHOTON-ATOM COLLISIONS
RESONANCE
SPECTRA
THRESHOLD ENERGY