ANGLE-RESOLVED PHOTOELECTRON SPECTROMETRY OF ATOMIC BROMINE USING SYNCHROTRON RADIATION

Using synchrotron-radiation-based angle-resolved photoelectron spectrometry we measured the relative partial cross sections and asymmetry parameters for all 4p-1 ionic states of atomic bromine between the 4p-1 1S0e and 4s-1 3P2o thresholds. The cross sections are placed on an absolute scale using previous data obtained with an electron spectroscopy modulation method. Attention is focused on autoionization phenomena due to the 4s(2)4p5 --> 4s4p5np one-electron and 4s(2)4p5 --> 4s(2)4p3nln'l' two-electron excitations. The 4s --> np Rydberg series strongly resembles the equivalent series in krypton. The autoionization profiles of the doubly-excited states are found to depend strongly on the continuum channel. Outside the resonances, non-relativistic Hartree-Fock calculations are in reasonable agreement with the present experimental results. Discrepancies are attributed to correlation and/or relativistic effects.