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American Physical Society, Physical Review A, 6(84)

DOI: 10.1103/physreva.84.063405

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Doubly resonant three-photon double ionization of Ar atoms induced by an EUV free-electron laser

Journal article published in 2011 by E. V. Gryzlova, Ri Ma, Ri, H. Fukuzawa, K. Motomura, A. Yamada, K. Ueda, A. N. Grum Grzhimailo, N. M. Kabachnik, S. I. Strakhova, A. Rouzee, A. Hundermark, M. J. J. Vrakking ORCID, P. Johnsson, K. Nagaya and other authors.
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This paper is available in a repository.

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Abstract

A mechanism for three-photon double ionization of atoms by extreme-ultraviolet free-electron laser pulses is revealed, where in a sequential process the second ionization step, proceeding via resonant two-photon ionization of ions, is strongly enhanced by the excitation of ionic autoionizing states. In contrast to the conventional model, the mechanism explains the observed relative intensities of photoelectron peaks and their angular dependence in three-photon double ionization of argon.