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Acta Physica Sinica (Overseas Edition)

Intense laser-induced autoionization of a "Λ" type atom

Gao‐xiang Li, Jin-sheng Peng

Published Aug 1, 1993• 0 citations
Publisher

Abstract

In this paper, we investigate the intense laser-induced autoionization about a "Λ" type atom by taking into account the second-order ionization processes. The effects of the second-order ionization processes and the second discrete state of the atom on the photoelectron spectrum are discussed.
DOI
10.1088/1004-423x/2/8/002

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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.
The atoms at autoionization state can be excited to higher continuum state, as well as transit to bond states by spontaneous emission a photon in laser induced autoionization. The effect of these processes on the laser induced autoionization process has been investigated by means of using the reaction matrix. The effect of spontaneous emission process is small in general case, but its spectrum shows that the emission is contributed mainly from the spontaneous Raman scattering enhanced by the cutoioni-zation state, and the Dressed atom picture was shown clearly. The multiphoton process makes the photoelectron spectra and laser induced autoionization process very complicated. For example, the photoelectron spectra of one and two-photon process have multi-maxium structure.