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Journal of Physics B Atomic and Molecular Physics

The influence of the pulse shape and chirp on the multipeak spectra in near-resonant Raman scattering and in autoionisation

Jakub Zakrzewski

Published Aug 14, 1986• 7 citations
Publisher

Abstract

The influence of the pulsed shape and/or chirp on multipeak structures that appear in both photoelectron spectra in laser-induced autoionisation and in near-resonant Raman-scattering photon spectra is investigated. The analytic results are presented for both types of spectra for a wide variety of smooth strong pulses. Possible experimental verification of the multipeak structures in the spectra is also discussed.

DOI
10.1088/0022-3700/19/15/007

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Journal of Physics B Atomic Molecular and Optical Physics•Apr 28, 1989•3 citations
The influence of the pulsed shape and/or chirp on multipeak structures that appear in both photoelectron spectra in laser-induced autoionisation and in near-resonant Raman-scattering photon spectra is investigated. The analytic results are presented for both types of spectra for a wide variety of smooth strong pulses. Possible experimental verification of the multipeak structures in the spectra is also discussed.
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.
Laser-induced autoionisation is discussed in the simple model in which the autoionising level is embedded in several atomic continua. The coupling to the second continuum can drastically diminish the characteristic narrowing in the photoelectron spectra near the confluence of coherences point. The results seem to be important for possible experimental verification of this narrowing, as in the real atom such coupling is hardly avoidable. The similarity of the effects caused by the spontaneous emission and by the coupling to the second continuum is pointed out.
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.
Atoms in an autoionisation state can be excited to higher states in the continuum as well as performing spontaneous transitions to bound states by laser-induced autoionisation. Both effects are investigated by means of the reaction matrix. Results obtained by Armstrong et al (1978) using the same method are extended. The shape of the photoelectron spectrum is different from that of the photon spectrum emitted from the autoionisation state but is similar to that of the photon spectrum emitted from the same bound state which is excited to the ionisation states in the former case. It is predicted that the shape of the fluorescence yield with the pump laser detuning is Lorentzian. The multiphoton process contributes to the photoelectron spectrum in a complicated way.