Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 51: Interaction with VUV and X-ray light III

A 51.4: Talk

Friday, March 21, 2014, 11:15–11:30, BEBEL E42

Photon-photon coincidence in the EUV regime for very large gas pressures after dissociation of hydrogen molecules in superexcited states into neutral fragments — •Philipp Schmidt¹, Philipp Reiss¹, André Knie¹, Arno Ehresmann¹, Kouichi Hosaka², Yuko Nakanishi², Ken-ichi Shiino², and Noriyuki Kouchi² — ¹Institut für Physik and Center for Interdisciplinary Nanostructure Science and Technology, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany — ²Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152, Japan

The time dependent fluorescence intensity in the EUV regime of molecular hydrogen after photoexcitation with an energy of 33.66 eV has been measured with a photon-photon coincidence setup starting at 2 Pa up to very high pressures of 150 Pa. At this energy, the resonant excitation of the superexcited Q₂ ¹ Π (1) state leads to neutral dissociation into hydrogen atoms, where both atoms can be excited with principal quantum numbers of n = 2 and n = 3. The angular correlation function, coincidence time spectra as well as individual detector intensity has been analysed in this large pressure region with respect to possible entanglement effects between the neutral fragments by using the 2p-1s decay by Ly-α emission.