Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Poster: Photoionization
A 21.6: Poster
Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof
Disentanglement of different excitation and decay pathways in the O 1s shape-resonance region of CO — •R. Püttner1, D. Ceolin2, O. Travnikova2, J. Palaudoux3, C. Miron3, M. Hoshino4, H. Kato4, H. Tanaka4, Y. Tamenori5, C. C. Wang6, K. Ueda6, and M. N. Piancastelli3,7 — 1Freie Universität Berlin, Germany — 2Synchrotron SOLEIL, Gif-sur-Yvette, France — 3Universite Pierre et Marie Curie, Paris, France — 4Sophia University, Tokyo, Japan — 5Japan Synchrotron Radiation Research Institute, Hyogo, Japan — 6Tohoku University, Sendai, Japan — 7Uppsala University, Sweden
Auger spectra of CO subsequent to O 1s ionization with 549.85 eV-photons, i.e. on top of the shape resonance, are presented. These spectra are compared with the normal Auger spectrum recorded at a photon energy well above the shape resonance revealing distinct differences. In particular, in the energy region of the O 1s−1 → b 1Π and O 1s−1 → a 1Σ+ Auger transitions additional narrow lines are found in the spectra.
In a detailed fit analysis of the spectra based on the approach presented in Ref. [1] it was found that distortions caused by post-collision interaction are absent. This identifies the additional lines as caused by resonant Auger processes. In addition, the angular distribution of these lines was investigated. From the analysis the resonant Auger decays could be assigned to transitions from the doubly excited state O 1s−1 4σ−1 2π 3lσ to the excited state 4σ−2 3lσ of CO+ with l = s or p.
[1] R. Püttner et al., Chem. Phys. Lett. 445, 6 (2007).