Mainz 2017 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 12: Posters 2: Molecular Dynamics, Clusters, and High Resolution Spectroscopy
MO 12.1: Poster
Mittwoch, 8. März 2017, 17:00–19:00, P OG1
Photoionization of Ne2: localized or delocalized? — Hendrik Sann1, •Abir Mhamdi2, Florian Trinter1, Markus Schöffler1, Philipp V. Demekhin2, Till Jahnke1, and Reinhard Dörner1 — 1Institut für Kernphysik, Universität Frankfurt, Frankfurt am Main, Germany — 2Institut für Physik, Universität Kassel, Kassel, Germany
We provide conclusive experimental evidence that for the van der Waals dimer Ne2, a proper post-selection of photoelectrons yields electron angular distributions which are of well-defined parity [1]. This post-selection can be achieved for 2p-ionization by detecting the fragmentation of the Ne2+ into Ne++Ne, and it is possible because the potential energy curve 2Σg+ is the only dissociating state of Ne2+(2p−1). The electron angular distribution for this dissociative state, measured by the COLTRIMS [2] technique, is symmetric with respect to the direction to which the charged fragment is emitted. The present observations are supported by ab-initio electronic structure and dynamics calculations which were carried out by the Single Center method and code [3]. We conclude that the picture of localization or delocalization of a single particle or hole in this many-body wave function is oversimplified. In coincidence experiments on molecular ionization, one has to carefully discuss what is veritably measured and to which basis this measurement projects set the few-body wave function just as in any coincidence measurement on entangled photons.
References: [1] H. Sann, et al., Phys. Rev. Lett., in press (2016). [2] R. Dörner, et al., Physics Reports 330, 96 (2000). [3] Ph. V. Demekhin, et al., Journal of Chemical Physics 134, 024113 (2011).