A time-dependent theory of resonant multiphoton ionization of atoms by short pulses. II. Strong field results for the two-photon ionization of caesium

Autor:	E J Robinson, A Adler, A Rachman
Rok vydání:	1995
Předmět:	Physics Rabi cycle Strong field chemistry.chemical_element Condensed Matter Physics Atomic and Molecular Physics and Optics Spectral line Power (physics) Two-photon excitation microscopy chemistry Caesium Ionization Physics::Atomic Physics Atomic physics Energy (signal processing)
Zdroj:	Journal of Physics B: Atomic, Molecular and Optical Physics. 28:5077-5091
ISSN:	1361-6455 0953-4075
DOI:	10.1088/0953-4075/28/23/015
Popis:	For pt.I see ibid., vol.28, p.5057-75 (1995). In the previous paper, a non-perturbative time-dependent theory of resonant multiphoton ionization by both smooth and rectangular pulses was derived, and as a first step, applied to the two-photon ionization of caesium in weak fields. In the present paper, we continue the analysis of the same system, extending the weak-field results and considering the case of stronger fields. At higher intensities the spectra exhibit energy modulations of a different character from those predicted for low power. Here, for stronger fields, the structure arises from Rabi oscillations, which, for the smooth pulses assumed here, are triggered by time-dependent Stark shifts. In order to obtain a better understanding of the energy oscillations, we also look at the photoelectron energy spectrum produced by a rectangular pulse, a problem which is solved exactly. We show that there are other sources of strong-field structure.
Databáze:	OpenAIRE
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