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A: Atomphysik
A 9: Photoionisation II (gemeinsam mit dem FV Molekülphysik)
A 9.4: Talk
Tuesday, April 4, 2000, 17:15–17:30, HS I
Study of the angular distributions of xenon NOO Auger electrons: determination of alignment- and intrinsic decay parameters — •Langer Burkhard1, Snell György2, Kukk Edwin2, and Berrah Nora2 — 1Max-Born-Institut für nichtlineare Optik und Kurzzeitspektroskopie, 12489 Berlin — 2Western Michigan University, Kalamazoo, MI 49008, USA
In the framework of the two-step model of Auger decay the alignment of the xenon 4d−1 primary hole states has been derived as a function
of photon energy. This quantity was obtained from angular distribution measurements of the N4,5O2,3O2,3 Auger lines after ionization of free Xe atoms by monochromatized synchrotron radiation of 80-250 eV photon energy. The data show a minimum of the alignment parameter in the Cooper
minimum of the 4d photoionization cross section, which proves the vanishing of the outgoing є f electron wave. These alignment parameters are compared to recent semi-empirical predictions and calculations [1]. Furthermore, the intrinsic parameters for all lines in this Auger group were determined and are compared to previous experiments and
calculations.
This work was supported by the Department of Energy, Office of Basic Energy Sciences, Chemical Sciences Division. One of us (B.L.) acknowledges the support of the Alexander von Humbold-Foundation.
[1] G. Snell, B. Langer, M. Drescher, N. Müller, U. Hergenhahn, J. Viefhaus, U. Heinzmann, and U. Becker, Phys. Rev. Lett. 82, 2480 (1999).