Angle-resolved photoelectron spectrometry of atomic bromine using synchrotron radiation

Using synchrotron-radiation-based angle-resolved photoelectron spectrometry the authors measured the relative partial cross sections and asymmetry parameters for all 4p -1 ionic states of atomic bromine between the 4p -1 1 S 0 e and 4s -1 3 P 2 0 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 4p 5 to 4s4p 5 np one-electron and 4s 2 4p 5 to 4s 2 4p 3 nln'l' two-electron excitations. The 4s to 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, nonrelativistic Hartree-Fock calculations are in reasonable agreement with the present experimental results. Discrepancies are attributed to correlation and/or relativistic effects.