Ab initio calculation of angle-resolved resonant Auger spectra of C2H2

none5Analytic expressions of the direct, resonant and interference contributions to the differential cross section of a resonant Auger process, produced by the photoionization of a linear molecule either "fixed-in-space" or belonging to a gas of randomly oriented molecules, have been derived following Dill's procedures but going beyond the two-step approximation. Angle-resolved Auger spectra of the C2H2 molecule measured on top of the C1s->pi* resonance have been calculated and compared with experiments, analysing also the different contributions to the electron angular distributions.noneR.Colle; D.Embriaco; M.Massini; S.Simonucci; S.TaioliR.Colle; D.Embriaco; M.Massini; S.Simonucci; S.Taiol