Vibrationally resolved photoelectron-spin-polarization spectroscopy of HI molecules

Abstract

The photoemission from HI is studied separately for different vibrational levels of the $^{2}\mathrm{\ensuremath{\Pi}}$ final ionic states using spin-resolved photoelectron spectroscopy with circularly polarized light. Constant-ionic-state measurements of the cross sections \ensuremath{\sigma} and the polarization parameters A indicate that all channels are strongly influenced by autoionization resonances. By combining these data, sums of partial contributions to \ensuremath{\sigma} are analyzed in detail to obtain specific information on the coupling of the resonances to the outgoing partial waves \ensuremath{\epsilon}\ensuremath{\lambda}. Apart from generally similar trends, the results show pronounced variations for different vibrational levels.