Hannover 2003 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Atomphysik
A 11: Postersitzung 1
A 11.32: Poster
Dienstag, 25. März 2003, 16:00–18:30, Poster
Measurement of spin-asymmetries in electron-impact S → P and S → D excitation of Cs atoms at intermediate energies. — •Nataša Pavlovic, Günter Baum, Ingo Ernsting, Stefan Förster, and Bernhard Roth — Fakultät für Physik, Universität Bielefeld, D-33501 Bielefeld
The determination of spin-polarization effects in electron scattering from Cs atoms has provided a challenge, experimentally as well theoretically, for many years. We have used crossed electron and atomic beams, both spin-polarized, to measure the angular dependences of the spin-asymmetries A1, A2, and Ann at selected energies in the range from 4 to 25 eV. The asymmetries can be related to electron exchange processes (Ann), to relativistic/spin-orbit effects (A2), or to an interference of these two mechanisms (A1). We will present our results for these asymmetries as well as our results for the relative differential cross sections. A comparison can be made in this theoretically difficult intermediate energy regime with recent calculations, which use either the relativistic R matrix method [Bartschat et al.], or the convergent close-coupling method [Bray et al.]. Before, we had reported on a detailed experimental and theoretical study of elastic scattering on the same system in the same energy range [1].
[1] G. Baum et al., Phys. Rev. A 66, 022705 (2002).