Frankfurt 2006 – scientific programme
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MO: Molekülphysik
MO 11: VUV Spectroscopy
MO 11.4: Talk
Monday, March 13, 2006, 11:45–12:00, H10
Accidental predissociation of the N2+(C 2Σu+) state observed in the C 2Σu+− X 2Σg+ fluorescence after vibrational selective excitation of the 1s−1π* resonance — •L Werner1, S Klumpp1, A Ehresmann1, Ph Demekhin2,3, M Lemeshko2, V Sukhorukov2,3, K-H Schartner4, and H Schmoranzer3 — 1Institute of Physics, University of Kassel, D-34132 Kassel — 2Rostov State University, 344038 Rostov-on-Don — 3TU Kaiserslautern , D-67653 Kaiserslautern — 4Justus-Liebig-University, D-35392 Giessen
N2+ (C−X) fluorescence was investigated by photon-induced fluorescence spectroscopy after vibrational selective excitation of the 1s−1π* resonance in the fluorescence wavelength range between 135nm - 205nm. One peculiarity of the N2+(C−X) fluorescence after direct excitation of the N2+(C) state is the strong intensity decrease for bands with v′ ≥ 3. In a first experiment only band sequences with Δ v=const. could be observed but with an improved fluorescence resolution of 0.1nm it was possible to observe single fluorescence bands with Δ v=-6/-7. Calculations predict a maximum of the fluorescence intensity at Δ v=−5 if accidental predissociation is taken into account. With a very narrow fluorescence resolution of about 0.1nm it was even possible to resolve individual vibrational bands. Observed fluorescence intensities for the individual vibrational sequences of the C-X transition and measured cross sections of the C-X fluorescence for vibrational sequences were compared to calculations with taking into account accidental predissociation and molecular rotation. The calculated intensities and describe well the shape of both individual vibrational bands and the whole band system.