Cross sections and beta values for ligand-field-split Br 3d orbitals in HBr

The ligand field in HBr results in the splitting of the Br3d orbitals into the 3d(delta) (d(x2-y2), d(xy)), 3d(pi) (d(xz), d(yz)), and 3d(sigma) (d(z) 2) orbitals. In core ionized HBr, the stronger spin-orbit splitting removes the remaining degeneracies and results in five different Br 3d eigenstates from linear combinations of the 3d(delta), 3d(pi), and 3d(sigma) orbitals. In high-resolution Pr 3d photoelectron spectra, as presented in this work, these five peaks are resolved. The photoelectron cross sections and beta v alues for the different d orbitals have been studied from 5 to 25 eV above threshold. The relative intensities for the different 3d orbitals are quite different at different analysis angles, showing that the beta values are d ifferent. Multiple-scattering-X alpha calculations give results in semiquan titative agreement with experiment.