Electronic state-lifetime interference in resonant Auger spectra: a tool to disentangle overlapping core-excited states. Issue 22 (20th May 2016) - Goldsztejn, Gildas
Abstract : Thanks to a new fit approach, electronic state-lifetime interference terms are extracted and used to disentangle overlapping states. Abstract : We have measured resonant-Auger decay following Cl 1s −1 excitations in HCl and CH3 Cl molecules, and extracted the pseudo-cross sections of different Cl 2p −2 final states. These cross sections show clear evidence of shake processes as well as contributions of electronic state-lifetime interference (ELI). To describe the spectra we developed a fit approach that takes into account ELI contributions and ultrafast nuclear dynamics in dissociative core-excited states. Using this approach we utilized the ELI contributions to obtain the intensity ratios of the overlapping states Cl 1s −1 4pπ/1s −1 4pσ in HCl and Cl 1s −1 4pe/1s −1 4pa1 in CH3 Cl. The experimental value for HCl is compared with theoretical results showing satisfactory agreement.