Outstanding Spin-Orbit-Activated Interchannel Coupling in the Cs and Ba 3d Photoemission
- Institut fuer Optik und Atomare Physik, Technische Universitaet Berlin, Hardenbergstrasse 36, 10623 Berlin (Germany)
- BESSY GmbH, Albert-Einstein-Strasse 15, 12489 Berlin (Germany)
- Science Faculty, Physics Department, Istanbul University, 34118 Vezneciler/Istanbul (Turkey)
- LIXAM, Centre Universitaire Paris-Sud, Batiment 350, 91405 Orsay Cedex (France)
Partial 3d{sub 5/2} photoionization cross sections of atomic Cs and Ba as well as the asymmetry parameter {beta} of the angular distribution of the Cs 3d{sub 5/2} photoelectrons were investigated near the threshold of the 3d{sub 3/2} channel at about 750 eV and 800 eV, respectively. Strong electron correlations, in particular, the spin-orbit activated interchannel coupling between the 3d{sub 5/2} and 3d{sub 3/2} channels, govern the observed spectra. The most striking effect was found for {beta}{sub 5/2} of Cs with a dramatic increase from {beta}=1.0 to {beta}=1.5 in the energy region where the mixing between both channels causes a pronounced minimum in the partial 3d{sub 5/2} cross section. This result indicates the decisive influence of the interference term on the asymmetry parameter {beta} with its dependence on the phase difference between the outgoing p and f waves.
- OSTI ID:
- 20951208
- Journal Information:
- Physical Review Letters, Vol. 98, Issue 14; Other Information: DOI: 10.1103/PhysRevLett.98.143002; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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