DISCRETE STRUCTURE IN THE 3D PHOTOABSORPTION SPECTRA OF NEUTRAL, SINGLY IONIZED AND DOUBLY IONIZED BROMINE

The 3d photoabsorption spectra of Br, Br+, and Br2+ have been recorded photographically in the 60-90 eV region using the dual-laser-produced plasma technique. In each case intense 3d-->4p transitions were obser ved while 3d-->np (n>4) features were also obtained in the spectrum of neutral bromine. The transitions were classified with the aid of mult iconfiguration Hartree-Fock calculations. The excited states are predi cted to decay by direct autoionization involving 4s or 4p electrons an d the rates for the different processes and resulting linewidths were also calculated. From these data theoretical cross sections for the ob served features were also computed.