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Journal of the Optical Society of America B

Effect of additional dc-field coupling on the long-time photoelectron spectrum from a system with double autoionizing levels

W. Leoński, R. Tanaś

Published Jan 1, 1991• 6 citations
Publisher

Abstract

The atomic model that contains two autoionization levels coupled to the discrete ground state by an external laser field is discussed. In addition both autoionizing levels are coupled mutually by the dc-electric-field gradient. The analytical formula for the long-time photoelectron spectrum is found for this system. Calculations are performed that are valid for any strength of the laser field and the dc-electric-field gradient. The effects of the additional coupling by the dc-electric-field gradient on the photoelectron spectrum are discussed and illustrated graphically.

DOI
10.1364/josab.8.000006

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The atomic model that contains two autoionization levels coupled to the discrete ground state by an external laser field is discussed. In addition both autoionizing levels are coupled mutually by the dc-electric-field gradient. The analytical formula for the long-time photoelectron spectrum is found for this system. Calculations are performed that are valid for any strength of the laser field and the dc-electric-field gradient. The effects of the additional coupling by the dc-electric-field gradient on the photoelectron spectrum are discussed and illustrated graphically.
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We investigate two atoms coupled with a quantized field mode. Whereas one is the Jaynes-Cummings (JC) two-level atom, the other is an autoionizing system with two discrete levels and a continuum of states. In case interactions between the atoms do not occur, the periodic behavior of the JC atom contrasts with the autoionizing system. We ask whether or not a seesaw-like interaction between the atoms can change the behavior of the JC atom. We present photoelectron spectra dependent on the time for various initial states of the field mode.
The authors calculate photoelectron spectra for a two-electron atom under the influence of two external driving fields, using an essential states formalism. They focus on the regime of so-called coherence transfer, in which electron-electron correlation transfers field-induced photo-coherence from one electron to the other. In the case studied here, two laser fields are resonant with coupled atomic transitions, in the manner familiar from three-level dark-state spectroscopy. Dynamical two electron effects are monitored via the photoelectron energy spectrum. The authors show that the distribution of the photoelectron energies can be singly, doubly or triply peaked depending on the relative laser intensities. The electron spectra are independent of the turn-on sequence of the fields.
We derive a parametrized formula for the photoionization cross section in the vicinity of an autoionizing state (AIS) coupled with another AIS by a strong laser field. The rotating-wave approximation is used and adiabaticity is assumed. In the probe field spectrum two Fano resonances contribute to the cross section, while a single resonance occurs in the strong-field spectrum. The correlation between the resonance shape and the complex energies of the laser-driven two-level system is described. Calculations are performed for the and AIS pair in He and for the and pair in Mg. The results agree with those obtained using time-dependent approaches. The formula for the cross section describes the spectral features of the ion yield measured in the two-photon ionization of the Mg atom via the AIS coupled with the state. The appearance of laser-induced degenerate states in the cross section shape is studied.