Two-Photon Inner-Shell Ionization in the Extreme Ultraviolet

V. Richardson, J.T. Costello, D. Cubaynes, S. Duesterer, J. Feldhaus, Hugo Van Der Hart, P. Juranic, W.B. Li, M. Meyer, M. Richter, A.A. Sorokin, K. Tiedke

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We have observed the simultaneous inner-shell absorption of two extreme-ultraviolet photons by a Xe atom in an experiment performed at the short-wavelength free electron laser facility FLASH. Photoelectron spectroscopy permitted us to unambiguously identify a feature resulting from the ionization of a single electron of the 4d subshell of Xe by two photons each of energy (93 +/- similar to 1) eV. The feature's intensity has a quadratic dependence on the pulse energy. The results are discussed and interpreted within the framework of recent results of ion spectroscopy experiments of Xe obtained at ultrahigh irradiance in the extreme-ultraviolet regime.
Original languageEnglish
Article number013001
Number of pages4
JournalPhysical Review Letters
Issue number1
Publication statusPublished - 29 Jun 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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