Berlin 2001 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Atomphysik
A 13: Photoionisation I (joint session A and MO)
A 13.6: Vortrag
Donnerstag, 5. April 2001, 17:00–17:15, H1012
Orientation and Alignment Dichroism in the 3p Photoionisation of Laser-polarised Fe atoms — •R. Müller1, M. Dickow1, P. Zimmermann1, J. Schulz2, Ph. Wernet2, B. Sonntag2, and M. Martins3 — 1Technische Universität Berlin, Inst. f. Atomare und Analytische Physik, Hardenbergstr. 36, D-10623 Berlin — 2Universität Hamburg, II. Institut für Experimentalphysik, Luruper Chaussee 149, D-22761 Hamburg — 3Freie Universität Berlin, Institut für Experimentalphysik, Arnimallee 14, D-14195 Berlin
Dichroism experiments are widely used in solid-state physics to investigate magnetic properties. For the most important ferromagnetic element, Fe, no data were available for free atoms yet. We present first experimental results on dichroism spectra in the 3p-photoelectron spectra of either oriented or aligned atoms. The ionisation was done by means of synchrotron light from the undulator beam line BW3 at HASYLAB.
The necessary ground state polarisation of the iron atoms was achieved by laser optical pumping around 372nm. This near-UV light was generated by a new combination of narrowband, single-mode cw laser and a subsequent frequency doubling in an external ring cavity.
The comparison with the standard theoretical approach for photoelectron angular distribution from polarised atoms shows deviations in some details but reasonable agreement in general.