Angle-resolved two-dimensional mapping of electron emission from the inner-shell 2p excitations in Cl2
Angle-resolved Auger and valence photoelectron spectra were measured over a 14-eV photon energy range across the Cl2 2p ionization thresholds. The measurements were carried out using highly efficient time-of-flight spectrometers 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-->σ* and 2p-->nl resonances were analyzed and the evolution of the resonant Auger to the normal Auger decay distorted by postcollision interaction was examined. We find that valence photoionization channels do not resonate strongly at the photon energies of the core-to-Rydberg excitation, in contrast to the strongly resonating ones observed in the HCl molecule. Auger decay spectra of the 2p-1σ* resonances showed no evidence of atomic transitions in Cl*, also in contrast to HCl. In addition, angular distribution of the photoelectron and Auger-electron lines was derived.
Physical Review A
- Pub Date:
- June 2001
- Autoionization photoionization and photodetachment;
- Auger effect and inner-shell excitation or ionization;
- Ultraviolet and vacuum ultraviolet photoelectron spectra