Spin-resolved resonant Auger spectroscopy of condensed iodine on Pt

Abstract

In molecular iodine condensed onto Pt the N 4,5 VV Auger electron intensity and the valence band photoemission intensity are resonantly enhanced if the photon energy is just the energy necessary for exciting 4d 5/2 and 4d 3/2 core electrons to unoccupied valence states derived from the molecular 5p σ u states. These resonant emission processes are studied by spin resolved electron spectroscopy using circularly polarized radiation for the primary excitation. In the spectra measured on-resonance, spectator and participator emission processes can clearly be distinguished by the energy and by the preferential spin direction of the emitted electrons. In the 4d 3/2 →5p σ u resonance spectrum an emission process following a 4d 3/2 →4d 5/2 Coster–Kronig decay of the primary excited hole-state can be identified by its spin polarization. For the spectator emission processes the two-hole states excited in the decay of the primary holes are predominantly coupled to a singlet.