München 2004 – scientific programme
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MO: Molekülphysik
MO 17: Poster II
MO 17.12: Poster
Thursday, March 25, 2004, 14:00–16:00, Schellingstr. 3
Competition between Autoionization and Dissociation into neutral fragments of the O2 vibronic Rydbergstates (c4Σu−)ns/ndσg 3Σu−(v=0,1) — •Sebastian Lucht1, Lutz Werner1, Stephan Klumpp1, Hans Schmoranzer1, Arno Ehresmann1, Phillip Demekhin2, Victor Sukhorukov2, Sven Kammer3, Sascha Mickat3, Rüdiger Schill3, and Karl-Heinz Schartner3 — 1Technische Universität Kaiserslautern — 2Rostov State University of Transport Communications — 3I. Physikalisches Institut Justus Liebig Universität Giessen
The competition between autoionization and dissociation into neutral fragments of the vibronic Rydberg states O2(c4Σu−)ns/ndσg 3Σu−(v=0 ,1) has been investigated using photon-induced fluorescence spectroscopy and the simultaneous measurement of the photo ion yield. For the vibronic Rydberg states (c4Σu−)ns/ndσg 3Σu−(v=1) strong features in the fluorescence wavelength region from 90 to 105 nm were observed but only weak features in the photo ion yield, indicating strong dissociation. In contrast for the vibronic Rydberg states (c4Σu−)ns/ndσg 3Σu−(v=0) only weak features were observed in the fragment fluorescence but strong features in the photo ion yield, indicating strong autoionisation. Experiments were performed with monochromatized synchrotron radiation with a bandwidth of Δ E=1.5 meV where it was possible to observe single rotational branches. The experiments are compared to ab-initio calculations for the partial autoionization and dissociation widths and to the corresponding simulations of spectroscopic shape of the rovibronic branches.