XENON 4D5/2-4D3/2 PHOTOELECTRON INTENSITY RATIO IN THE REGION OF THE COOPER MINIMUM

The photoelectron intensity ratio of the xenon 4d spin-orbit components has been studied at four photon energies between 132 and 192 eV and at a photon-photoelectron angle of 90 degrees . The 4d5/2/4d3/2 ratios obtained are: 1.34+or-0.04 at 132.50 eV, 1.33+or-0.07 at 151.65 Ev, 1.22+or-0.15 at 171.69 eV and 1.65+or-0.15 at 192.53 eV. Data are compared with relativistic single-particle calculations (Dirac-Slater and Dirac-Fock) and multi-body predictions (relativistic random phase approximation, RRPA). The RRPA results agree satisfactorily with the experimental values.