title: The ion microscope as a tool for quantitative measurements in the extreme ultraviolet.
abstract: We demonstrate a tool for quantitative measurements in the extreme ultraviolet (EUV) spectral region measuring spatially resolved atomic ionization products at the focus of an EUV beam. The ionizing radiation is a comb of the 11(th)-15(th) harmonics of a Ti:Sapphire femtosecond laser beam produced in a Xenon gas jet. The spatial ion distribution at the focus of the harmonics is recorded using an ion microscope. Spatially resolved single- and two-photon ionization products of Argon and Helium are observed. From such ion distributions single- and two-photon generalized cross sections can be extracted by a self-calibrating method. The observation of spatially resolved two-EUV-photon ionization constitutes an initial step towards future single-shot temporal characterization of attosecond pulses.
authors: Foundation for Research and Technology - Hellas, Institute of Electronic Structure &Laser, PO Box 1527, GR71110 Heraklion (Crete), Greece.|Department of Physics, University of Crete, PO Box 2208, GR71003 Heraklion (Crete), Greece.
authors: N
authors: N
authors: Tsatrafyllis
authors: Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
authors: B
authors: B
authors: Bergues
authors: Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
authors: H
authors: H
authors: Schröder
authors: Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.|Department of Physics, Umeå University, SE-901 87 Umeå, Sweden.
authors: L
authors: L
authors: Veisz
authors: Foundation for Research and Technology - Hellas, Institute of Electronic Structure &Laser, PO Box 1527, GR71110 Heraklion (Crete), Greece.
authors: E
authors: E
authors: Skantzakis
authors: Foundation for Research and Technology - Hellas, Institute of Electronic Structure &Laser, PO Box 1527, GR71110 Heraklion (Crete), Greece.
authors: D
authors: D
authors: Gray
authors: Foundation for Research and Technology - Hellas, Institute of Electronic Structure &Laser, PO Box 1527, GR71110 Heraklion (Crete), Greece.|Wigner Research Center for Physics, 1121 Budapest, Hungary.
authors: B
authors: B
authors: Bodi
authors: ELI Attosecond Light Pulse Source, ELI-Hu Kft., Dugonics ter 13, 6720 Szeged, Hungary.
authors: S
authors: S
authors: Kuhn
authors: Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany.
authors: G D
authors: GD
authors: Tsakiris
authors: Foundation for Research and Technology - Hellas, Institute of Electronic Structure &Laser, PO Box 1527, GR71110 Heraklion (Crete), Greece.|Department of Physics, University of Crete, PO Box 2208, GR71003 Heraklion (Crete), Greece.|ELI Attosecond Light Pulse Source, ELI-Hu Kft., Dugonics ter 13, 6720 Szeged, Hungary.
authors: D
authors: D
authors: Charalambidis
authors: Foundation for Research and Technology - Hellas, Institute of Electronic Structure &Laser, PO Box 1527, GR71110 Heraklion (Crete), Greece.|ELI Attosecond Light Pulse Source, ELI-Hu Kft., Dugonics ter 13, 6720 Szeged, Hungary.
authors: P
authors: P
authors: Tzallas