Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 13: Photoionization
A 13.6: Vortrag
Dienstag, 13. März 2012, 11:45–12:00, V55.01
Phase Dependence of the β-Oscillations in N2 and O2 — •Markus Ilchen1, Markus Braune1,2, Sascha Deinert1, Leif Glaser1, André Meissner2, Frank Scholz1, Lokesh Tribedi2,3, Peter Walter1, Jens Viefhaus1, and Uwe Becker2 — 1DESY, Hamburg, Germany — 2Fritz-Haber-Institut, Berlin, Germany — 3Tara Institute of Fundamental Research, Mumbai, India
Oscillations in the partial photoionization cross sections of homonuclear diatomic molecules have been described by Cohen and Fano more than 40 years ago as an interference phenomenon analogous to a double slit experiment. These cross section oscillations have been verified by several experiments in the meantime. In addition to the cross section however, also the angular distribution asymmetry parameter β and most likely all spin parameters are showing oscillations. The physical reason of these oscillations has not necessarily to be only the partial cross section and such effects could also be caused by phase shifts of the outgoing photoelectron partial waves. Photoionization of homonuclear diatomic molecules such as H2, N2 and O2 should show non-vanishing oscillating spin polarization in this respect. A persisting oscillation after multiplication of the oscillations of β and σpartial indicates a dependence on the phase shift of the photoelectron partial waves. In the light of a double slit experiment this is unexpected and has to be discussed by theory more deeply.