Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)
A 5.5: Poster
Dienstag, 3. April 2001, 12:30–15:00, AT3
Orientation and alignment of photoionized atoms — •U. Kleiman and B. Lohmann — Universität Münster, Institut für Theoretische Physik, Wilhelm-Klemm-Straße 9, D-48149 Münster, Germany
The knowledge of orientation and alignment of excited or ionized atoms is essential for determining the properties of the emitted Auger electrons. The angular distribution and dynamic spin polarization depend on the alignment, which has already been calculated for various ions within the Herman-Skillman approximation [1]. The transferred spin polarization of the emitted Auger electrons, however, originates from the orientation of the excited or ionized atoms. Though the transferred spin polarization is in general large and numerous experimental studies have been done in recent years, hardly any numerical values of the orientation are available.
In view of this we have calculated both, alignment and orientation. The calculation has been performed within the Hartree-Fock approximation and considers all singly photoionized atoms with a 1S0 ground state configuration where all sorts of ionic hole states from 2p1/2 up to 6p3/2 have been taken into account. The kinetic energy of the emitted photoelectron has been varied between zero and at least 20 Ry. Within the considered energy region the dipole approximation is applicable.
Our results are compared with Herman-Skillman calculations [1] and different experimental data.
[1] E. G. Berezhko, N. M. Kabachnik and V. S. Rostovsky: J. Phys. B: At. Mol. Phys. 11, 1749 (1978)