Spin-polarization spectroscopy of Auger electrons and photoelectrons in 5pionization of barium atoms

Coherence and correlations in photoinduced Auger and fluorescence cascades in atoms

“…Unusually large anisotropy as well as large forward-backward asymmetry have been reported in some of those experiments (see discussion in Yamaoka et al, 2002Yamaoka et al, , 2003Santra et al, 2007 and references therein) in drastic disagreement with the theoretical predictions. Recent, more precise and accurate measurements at SR sources, showed a very small anisotropy of L X-ray lines (Küst et al, 2003;Yamaoka et al, 2003Yamaoka et al, , 2006Barrea et al, 2005) in complete agreement with the theoretical predictions. As it was suspected, the measurements with the radionuclides, which were interpreted as showing large alignment, contained some large systematic errors probably connected with self-absorption of the produced X-rays in the solid target.…”

“…Starting from the pioneering experiments by Stoppmanns et al (1992), Kuntze et al (1993Kuntze et al ( , 1994a and David et al (1994David et al ( , 1998) (see also review papers by Heinzmann (1996a, b)), spin polarization measurements for Auger and resonant Auger electrons have added a new dimension to the investigation of the Auger emission of atoms and provide a very sensitive test-ground for the theoretical description of autoionization processes (Kuntze et al, 1994b;Snell et al, 1996Snell et al, , 1999aSnell et al, , b, 2002Hergenhahn et al, 1999;Schmidtke et al, 2000aSchmidtke et al, , 2001Drescher et al, 2003;Lohmann et al, 2005). Moreover, spin resolved experiments have been recognized as a necessary component for performing a complete experiment (see Section 3.3).…”

Dynamically Induced Spin Polarization of Resonant Auger Electrons

“…In an early experimental attempt to verify this prediction, a very weak polarization effect in Kr Auger decays after impact of (unpolarized) 1.5 keV electrons was reported [9]. The dynamical spin polarization of Auger electrons after photoionization of free Ba atoms has been measured to be zero within experimental uncertainty [10]. Thereafter it was generally believed that impact of particles or photons possessing no helicity is not effective in transferring a spin polarization to secondary processes.…”

Characterization of Ferroelectric Property of C-Axis- and Non-C-Axis-Oriented Epitaxially Grown Bi2VO5.5 Thin Films

“…The first angle-and spin-sensitive experiment was performed by Hahn et al (1985), which marked the beginning of a series of studies on both sides, experiment as well as theory, where primary excitation and ionization processes with electrons, protons and photons have been considered (e.g. Kabachnik and Sazhina 1988, Tulkki et al 1993, Lohmann et al 1993, Kuntze et al 1994, Müller et al 1995, Hergenhahn 1996, Snell et al 1996, Kleiman et al 1999.…”