Frankfurt 2006 – wissenschaftliches Programm
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A: Atomphysik
A 13: Photoionisation
A 13.6: Vortrag
Mittwoch, 15. März 2006, 15:30–15:45, H7
Angle and spin resolved Auger emission analysis from the resonantly excited Ar* (2p1/2−1 3d3/2)J = 1 state — •Bernd Lohmann1, G Turri2, B Langer3, G Snell4, S Canton5, U Becker6, and N Berrah5 — 1Inst. f. Theo. Physik, Univ. Münster, 48149 Münster — 2Creol Coll. of Opt. and Phot., Univ. of Central Florida, USA — 3MBI f. Nichtlin. Optik und Kurzzeitspektr., 12489 Berlin — 4ALS, Lawrence Berkeley Natl. Labs., Berkeley, USA — 5West. Michigan Univ., Dept. of Physics, Kalamazoo, USA — 6Fritz-Haber-Inst. der MPG, 14195 Berlin
Using circularly polarized synchrotron radiation for a primary photoionization process, the subsequently emitted Auger electrons are usually spin polarized due to polarization transfer. The transferred spin polarization can be expected large due to the asymmetric m-sublevel population generated by the circularly polarized light. On the other hand, the emitted Auger electrons can show a dynamic spin polarization induced by linearly or even unpolarized light, which is caused by the inherent alignment of the exciting photons due to their transversal character. The dynamic spin polarization exhibits higher values only if certain conditions for the number of contributing partial waves, relative phases and, in part, fine structure splitting are fulfilled. We report on a combined experimental and theoretical analysis and interpretation of the angle and spin resolved L2M2,3M2,3 Auger emission following a resonant excitation to the Ar* (2p1/2−1 3d3/2)J = 1 states using either circularly or linearly polarized light. Our numerical results obtained within a relativistic distorted wave approximation (RDWA), and our experimental data obtained at the Advanced Light Source (ALS) in Berkeley are presented.