29 research outputs found
Threshold photoelectron photoion coincidence spectroscopy of trichloroethene and tetrachloroethene
The threshold photoelectron, the threshold photoelectron photoion coincidence and ion breakdown spectra of trichloroethene and tetrachloroethene have been recorded from 9 – 22 eV. Comparisons with the equivalent data for the three dichloroethene molecules and theoretical calculations highlight the nature of the orbitals involved during photoionisation in this energy range. The ground electronic state of CHCl (CCl) is bound, with excited valence states dissociating to CHCl (CCl) and CHCl (CCl). Appearance energies suggest that CHCl forms from CHCl by loss of two chlorine atoms, whereas CCl forms from CCl by loss of a Cl molecule. The translational kinetic energy release into CHCl (CCl) + Cl is determined as a function of energy. In both cases, the fraction of the available energy released into translational energy of the two products decreases as the photon energy increases
Dissociative photoionisation of molecules probed by triple coincidence; double time-of-flight techniques
Vacuum UV fluorescence excitation spectroscopy of BCl3 in the range 35-140 nm: new electronic transitions in BCl3+ and the BCl2 free radical
Dynamics of the shake-up satellites of C 1s excited carbon dioxide studied by threshold electron spectroscopy
Absolute cross sections of new and previously observed C 1s shake-up satellites of CO2 have been measured using threshold photoelectron spectroscopy in the photon energy range 306-320 eV. The electron dynamics involved in this process are elucidated by identifying the satellites with ionic states of CO2+ and NO2+ via a qualitative `frozen core' argument, allowing timescales of the C 1s hole decay for each satellite to be estimated