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Optics Communications

Laser-induced narrowing and shift of autoionizing resonances in multiphoton ionization spectrum

Yu. I. Heller, A. K. Popov

Published Sep 1, 1981• 9 citations
Publisher
DOI
10.1016/0030-4018(81)90062-6

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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

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.

Acta Physica Sinica•Jan 1, 1989•1 citation

Resonances in Multiphoton Ionization

P. Lambropoulos, Xiaofeng Tang

Advances in atomic, molecular, and optical physics•Jan 1, 1992•1 citation
We study a theoretical model of photoionization. An initially occupied ground electronic state is ionized to a flat continuum by two-photon excitation. There are two near-resonant intermediate excitation states. The line-narrowing confluence effect and population trapping are studied. We show that we cannot define an effective Hamiltonian to relate our model to the Fano model. In connection with recent studies of laser-induced autoionization (LIA), we show several differences between our model and LIA. For example, we show that the zero in the absorption spectrum and in the photoelectron spectrum has different features compared with that in the Fano model [ Phys. Rev.124, 1866 ( 1961)]. We also show that a laser-power-independent confluence condition and a complete population-trapping condition can be found in our model.