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A: Fachverband Atomphysik
A 22: Interaction with VUV and X-ray light
A 22.6: Poster
Tuesday, March 1, 2016, 16:30–19:00, Empore Lichthof
Probing O2+ potential curves with an XUV–IR pump–probe experiment — •Philipp Cörlin1, Andreas Fischer1, Tomoya Mizuno1, Michael Schönwald1, Uwe Thumm2, Thomas Pfeifer1, and Robert Moshammer1 — 1Max-Planck-Insitut für Kernphysik — 2Kansas State University
We study dissociative photo-ionization of O2 in a kinematically complete XUV–IR pump–probe experiment, preparing a vibrational wave packet in the potential of the binding O2+(a 4Πu) state by ionization with a single XUV photon. After a variable time–delay the wave packet is promoted to the repulsive O2+(f 4Πg) state by a weak IR probe pulse. Comparing the results of a coupled–channel simulation with the experimental kinetic–energy-release and quantum–beat spectra, we are able to discriminate between the adiabatic O2+ potential–energy curves (PECs) calculated by Marian et al., Mol. Phys. 46, 779 (1982) and Magrakvelidze et al., Phys. Rev. A 86, 023402 (2012). The overall agreement between simulated and experimental results is good; however, not all features of the experimental spectra could be reproduced using these PECs. Using a Morse potential adjusted to the experimental data instead, most features of the experimental spectra are well reproduced by our simulation. This optimized Morse potential is remarkably similar to the theoretically predicted PECs, demonstrating the sensitivity of our experimental method to small changes in the shape of the binding potential.