X-ray absorption structures of multielectron excitation in Br

Detailed qualitative x-ray absorption spectra near the K edge of ${\mathrm{Br}}^{\mathrm{-}}$ in organic solvents have been measured using synchrotron radiation. Several structures similar to those assigned to multielectron excitations in noble gases were detected on ${\mathrm{Br}}^{\mathrm{-}}$ in solution. They were analyzed in terms of the shake-up and shake-off processes. The [1s4p], [1s4s], [1s3d], and [1s3p] transitions have been identified and two additional absorption edges have been found between [1s3p] and [1s3d] and between [1s4s] and [1s3d] double-electron excitation edges, respectively. The importance of multielectron excitation in x-ray absorption spectra is discussed.