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A: Fachverband Atomphysik

A 7: Interaction with VUV and X-ray light I

A 7.6: Talk

Monday, March 18, 2013, 15:15–15:30, B 302

Ly-α coincidence after dissociation of hydrogen molecules in superexcited states into neutral fragments — •Philipp Schmidt, Philipp Reiß, Benjamin Kambs, André Knie, and Arno Ehresmann — Institut für Physik and Center for Interdisciplinary Nanostructure Science and Technology, Universität Kassel, Heinrich-Plett-Straße 40, D-34132 Kassel, Germany

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 at different pressures in the range of 0.1 to 0.4 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 coincidence time spectra as well as individual detector intensity has been analysed with respect to the fluorescence lifetimes for the different pressures, especially the 2p-1s decay by Lyα emission.