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MO: Molekülphysik
MO 11: VUV Spectroscopy
MO 11.3: Talk
Monday, March 13, 2006, 11:30–11:45, H10
Probing the dicationic final states in CO using KVV normal Auger transitions — •Ralph Püttner1, Xia-Jing Liu2, Georg Prümper2, Toralf Lischke2, Vincenzo Carravetta2,3 und Kiyoshi Ueda2 — 1Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, 14195 Berlin, Germany — 2Inst. Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan — 3IPCF- CNR, 56124 Pisa, Italy
It is well known that the KVV normal Auger spectra of CO subsequent to the C 1s and O 1s photoionization exhibit a rich vibrational fine structure, which is due to the fact that the resulting dications are stable with respect to dissociation. We present high-resolution normal Auger spectra together with the corresponding photoelectron spectra. All four spectra are fitted parallel using a Franck-Condon fit procedure which allows to take vibrational lifetime interference contributions into account. With this analysis we were able to identify for the first time contributions of the O 1s−1 → X3Π Auger transition in the spectrum. In addition, the equilibrium distances, vibrational energies, and anharmonicities for the dicationic final states X3Π, a1Σ+, b1Π, A3Σ+, and d1Σ+ were derived and compared with theoretical results [1]. While for the final states a1Σ+, b1Π, A3Σ+, and d1Σ+ an excellent agreement between experiment and theory is found, we observe significant differences for the state X3Π. We assume that these differences are due to an avoided level crossing which is not taken into account in the calculations.
[1] J. H. D. Eland et al., J. Phys. B 37, 3197 (2004).