Angle-resolved photoelectron spectrometry of atomic bromine using synchrotron radiation

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Abstract
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 1S0e and 4s-1 3P20 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 4s24p5 to 4s4p5np one-electron and 4s24p5 to 4s24p3nln'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.