Outstanding spin-orbit-activated interchannel coupling in the Cs and Ba 3d photoemission

RICHTER T., HEINECKE E., ZIMMERMANN P., GODEHUSEN K., Yalcinkaya M., CUBAYNES D., ...Daha Fazla

PHYSICAL REVIEW LETTERS, cilt.98, sa.14, 2007 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 98 Sayı: 14
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1103/physrevlett.98.143002
  • Dergi Adı: PHYSICAL REVIEW LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • İstanbul Üniversitesi Adresli: Evet

Özet

Partial 3d(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(5/2) photoelectrons were investigated near the threshold of the 3d(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(5/2) and 3d(3/2) channels, govern the observed spectra. The most striking effect was found for beta(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(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.