Angle-resolved two-dimensional mapping of electron emission from the inner-shell 2p excitations in Cl-2 - art. no. 062719

Angle-resolved Auger and valence photoelectron spectra were measured over a 14-eV photon energy range across the Cl-2 2p ionization thresholds. The me asurements were carried out using highly efficient time-of-flight spectrome ters coupled with photons from the Atomic and Molecular undulator beamline of the Advanced Light Source and an advanced data-acquisition system. Auger -electron spectra of 2p --> sigma* and 2p --> nl resonances were analyzed a nd the evolution of the resonant Auger to the normal Auger decay distorted by postcollision interaction was examined. We find that valence photoioniza tion channels do not resonate strongly at the photon energies of the core-t o-Rydberg excitation, in contrast to the strongly resonating ones observed in the HCl molecule. Auger decay spectra of the 2p (-1)sigma* resonances sh owed no evidence of atomic transitions in Cl*, also in contrast to HCl. In addition. angular distribution of the photoelectron and Auger-electron line s was derived.