Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Interaction with VUV and X-ray light III
A 14.2: Hauptvortrag
Freitag, 18. März 2011, 11:00–11:30, BAR 106
Doppler effect in fragment autoionization following core-to-valence excitation in molecular oxygen. — •Marc Simon1, Renaud Guillemin1, and Eiji Shigemasa2 — 1Laboratoire de Chimie Physique-Matière et Rayonnement, 11 rue Pierre et Marie Curie, 75005 Paris, France — 2Ultraviolet Synchrotron Orbital Radiation Facility, Institute for Molecular Science, Okazaki 444-8585, Japan
Nuclear motion in ultrafast dissociation of core excited molecules can be probed by the Doppler effect in emitted Auger electrons as experimentally first evidenced at the core-to-valence excitation in molecular oxygen by Björneholm et al. [1].
We address the question of multiple Auger decay. Although cascade Auger decay has been known and studied for a long time in atoms, a detailed study of cascade Auger decay following resonant core excitation in a molecule, namely CO, was reported only recently [2].
We report the observation of a Doppler effect in secondary Auger electron emission from excited atomic oxygen fragments created after core 1s excitation in molecular oxygen [3].
References
[1] O. Björneholm et al., Phys. Rev. Lett. 84, 2826 (2000). [2] L. Journel et al., Phys. Rev. A 77, 042710 (2008). [3] R. Guillemin et al., Phys. Rev. A 82, 051401 (2008).