Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 28: Poster: Interaction with VUV and X-ray light II

A 28.15: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

XUV-pump/IR-probe studies of photoionization and dissociation of N2O — •Michael Schönwald1, Philipp Cörlin1, Andreas Fischer1, Tomoya Mizuno1, Alexander Sperl1, Arne Senftleben2, Joachim Ullrich3, Thomas Pfeifer1, and Robert Moshammer11Max-Planck Institut für Kernphysik, Heidelberg, Deutschland — 2Institut für Physik, Universität Kassel, Deutschland — 3Physikalisch-Technische Bundesanstalt, Braunschweig, Deutschland

We present the results of kinematically complete XUV-pump/IR-probe experiments on nitrous oxide (N2O) using a reaction microscope. A train of attosecond XUV pulses, produced via high harmonic generation in an Ar-filled gas cell, covers the energy range from 20 to 50 eV, in which the molecule can either be singly ionized or directly doubly ionized. In addition, the excited cation N2O+* in a state near the double ionization threshold can either dissociate into a charged and a neutral fragment or it autoionizes into N2O2+, which subsequently leads to a Coulomb explosion into two charged fragments that are detected in coincidence (N2O2+N++NO+ or N2O2+N2++O+). We investigated the influence of the additional IR-field on the double ionization yield. Both decay channels are enhanced but respond differently [1]. In addition we present the corresponding photoelectron energy spectra, which show indications for the autoionization process and its dependence on the delay and the kinetic energy release of the respective ions.
[1] X.Zhou et al., Nature Physics Vol.8, March 2012

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