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München 2004 – scientific programme

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MO: Molekülphysik

MO 17: Poster II

MO 17.11: Poster

Thursday, March 25, 2004, 14:00–16:00, Schellingstr. 3

Photodissociation processes of Rydberg states in N2 in the exciting-photon energy ranges between 23  eV to 24.3  eV and 25.6  eV to 26.7  eV — •Lutz Werner1, Sebastian Lucht1, Stephan Klumpp1, Hans Schmoranzer1, Arno Ehresmann1, Sven Kammer2, Sascha Sukhorukov2, Rüdiger Schill2, and Karl-Heinz Schartner21Technische Universität Kaiserslautern — 2I. Physikalisches Institut Justus Liebig Universität Giessen

It has been recently shown that neutral photodissociation of the O2 (c4 Σu)nlλ 3Σu,(v=0,1) and the CO (4Σu)nsσg ΣuRydberg states are state selective. They dissociate into neutral fragments where one of the fragments is in a Rydberg state as well and where the effective principal quantum number of the Rydberg electron is conserved. N2 Rydberg states (C2 Σu+)nsσ  (v) were investigated using monochromized synchrotron radiation to clarify whether such a behavior can also be observed in N2. Dispersed fluorescence from excited NI fragments in the spectral ranges from 114  nm to 135  nm and simultaniously from 82  nm to 102  nm in the exciting-photon energy range from 23  eV to 24.3  eV and 25.6  eV to 26.7  eV was investigated. The exciting photon energy range was chosen such that it lies just beneath the thresholds for dissociative ionisation into the fragments NII(3P)+NI(4S) and NII(3P)+NI(2D). In this exciting energy regions intensities from NI fragment fluorescence transitions 2p2(3P)3s 4P→2p3 4S, 2p2(3P)3d 2P→2p3 4S and from transitions in the VUV-region 2p2(3P)nd and 2p2(3P)ns were measured as functions of the exciting-photon energy with the very narrow bandwidth of 2meV.

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