Two-photon inner-shell ionization in the extreme ultraviolet
Richardson, Vincent and Costello, John T. and Cubaynes, D. and Düsterer, S. and Feldhaus, J. and van der Hart, H. and Juranić, P. and Li, Wei B. and Meyer, M. and Richter, M. and Sorokin, A.A. and Tiedke, K. (2010) Two-photon inner-shell ionization in the extreme ultraviolet. Physical Review Letters, 105 (1). 013001-1. ISSN 0031-9007
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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±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.
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