Hamburg 2009 – scientific programme
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MO: Fachverband Molekülphysik
MO 23: Molekülphysik Poster 2
MO 23.13: Poster
Thursday, March 5, 2009, 16:30–19:00, VMP 8 Foyer
Lifetime vibrational interference during the CO 1s−1 π∗ (vr) resonance excitation investigated by the CO+ (A 2Π → X 2Σ+) dispersed fluorescence — •Philipp Reiß1, Witoslaw Kielich1, Andre Knie1, Rainer Hentges1, Irina Haar1, Philipp V. Demekhin2, Ivan D. Petrov2, Viktor L. Sukhorukov2, and Arno Ehresmann1 — 1Institute of Physics and CINSaT, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany — 2Rostov State University of Transport and Communications, 344038 Rostov-on-Don, Russia
Dispersed fluorescence from fragments formed after the de-excitation of the 1s−1 π∗ resonances of C∗O and CO∗ molecules has been measured by photon-induced fluorescence spectroscopy (PIFS) in the spectral range from 378 nm to 578 nm.
The excitation was performed with synchrotron radiation from the U49/2 PGM1 beamline at BESSY II.
The investigated fluorescence range is dominated by lines of atomic carbon and oxygen fragments and by the A 2Π(v′) → X 2Σ+(v″) fluorescence bands of CO+ ion resulting from the participator Auger decay of the 1s−1 π∗ resonances.
The ratios of the natural lifetime width of the 1s−1 π∗ resonances, ΓR, and the energy spacing between their vibrational levels, ωe, are equal to the 0.32 and 0.95 for the C∗O and CO∗ resonances, respectively, providing a prototype for an expected strong (CO∗) and weak (C∗O) lifetime vibrational interference.