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Acta Physica Sinica

PEAK-SWITCHING OF THE PHOTOELECTRON SPECTRUM

Guanhua Yao, XU ZHI-ZHAN, (1)中国高等科学技术中心(世界实验室)凝聚态和辐射物理分中心; (2)中国科学院上海光学精密机械研究所

Published Jan 1, 1989• 1 citation
Publisher

Abstract

The photoelectron spectrum from autoionizing atoms in strong laser field is investigated on the basis of ref [12] . Peak-switching similar to the corresponding effect in strong field multiphoton ionization is found, implying that the second-order ionization processes and high-order photoelectron peaks play essential roles in strong laser-field induced autoionization-These results show that many of previous results need to be revised.

DOI
10.7498/aps.38.864

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Acta Physica Sinica•Jan 1, 1991•0 citations
The photoelectron spectrum from autoionizing atoms in strong laser field is investigated on the basis of ref [12] . Peak-switching similar to the corresponding effect in strong field multiphoton ionization is found, implying that the second-order ionization processes and high-order photoelectron peaks play essential roles in strong laser-field induced autoionization-These results show that many of previous results need to be revised.
Strong-field autoionization induced by smooth laser pulses is studied to take into account the high-order ionization processes. A second-order differential equation of the amplitude of the ground state is derived. For some special laser pulses, which include all the exponential ones, analytical results may be obtained. As an example, the explicit results of ground-state population and the photoelectron spectrum are given for an exponentially switched-on cw pulse. The multipeak structure in the photoelectron spectrum is more obviously manifested in the high spectrum resulted from the high-order ionization processes.
Strong laser-field-induced autoionisation in the presence of both photoionising and radiative decay of the autoionising state (AS) is investigated, focusing on the laser intensity dependence of the photoemission and photoelectron spectra. In contrast to previous predictions, power broadening and increasing reduction of the doublet peak heights with field strength are found in the photoemission spectrum. Similar effects leading to considerable suppression and even complete disappearance of the lowest-order peaks in the photoelectron spectrum, together with peak switching, are also demonstrated, which are closely related to above-threshold ionisation. In addition, it is suggested that the total number of energetic photoelectrons may serve as an alternative to measuring the atomic parameters of the AS. All these effects are attributed to the presence of the strong 'probe': laser-induced decay of the AS.
The photoionization of atoms in a strong electromagnetic field leads to the effect of "above-threshold" ionization, displaying a number of peaks in the energy spectrum of the photoelectrons. In the case of a one-electron model atom in a circularly polarized field, we derive expressions that describe the position as well as the intensity of those peaks as a function of the field parameters by means of a nonperturbative method. It is immediately clear from our formulas that the lowest-energy peaks in general disappear with increasing field intensity, for Coulomb-like as well as shortrange potentials. For a zero-range potential, a numerical evaluation is easily performed, leading to results that are in every respect qualitatively similar to the experimental results obtained thus far on these kinds of processes.
Previous studies on strong-field autoionization involving high-order ionization processes are mainly investigated for the cases of CW laser irradiations. This paper extends those studies to the cases of square laser pulses with arbitrary widths. Populations of the ground state and the line shapes of the autoionizing resonance are discussed. It is shown that strong-field autoionization and the high-order ionization processes are drastically affected not only by the intensities but also by the time of interaction between atoms and laser field.