Two-Photon Inner-Shell Ionization in the Extreme Ultraviolet

V. Richardson, J. T. Costello, D. Cubaynes, S. Düsterer, J. Feldhaus, H. W. van der Hart, P. Juranić, W. B. Li, M. Meyer, M. Richter, A. A. Sorokin, and K. Tiedke

Phys. Rev. Lett. 105, 013001 – Published 29 June 2010

Abstract

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 $4 d$ subshell of Xe by two photons each of energy $(93 \pm 1) eV$ . 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.

Received 19 February 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.013001

Authors & Affiliations

V. Richardson¹, J. T. Costello¹, D. Cubaynes², S. Düsterer³, J. Feldhaus³, H. W. van der Hart⁴, P. Juranić³, W. B. Li^3,5, M. Meyer², M. Richter^6,*, A. A. Sorokin^3,6,7, and K. Tiedke³

¹School of Physical Sciences and NCPST, Dublin City University, Dublin 9, Ireland
²LIXAM/CNRS, Centre Universitaire Paris-Sud, Bâtiment 350, 91405 Orsay Cedex, France
³Deutsches Elektronen-Synchrotron, DESY, Notkestraße 85, 22603 Hamburg, Germany
⁴School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, United Kingdom
⁵Institute of Precision Optical Engineering, Department of Physics, Tongji University, 1239 SiPing Road, Shanghai 200092, China
⁶Physikalisch-Technische Bundesanstalt, PTB, Abbestraße 2-12, 10587 Berlin, Germany
⁷Ioffe Physico-Technical Institute, Polytekhnicheskaya 26, 194021 St. Petersburg, Russia

^*mathias.richter@ptb.de

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Vol. 105, Iss. 1 — 2 July 2010

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