Abstract
Abstract The fragmentation of vapour-phase KCl molecules was studied by using synchrotron radiation excitation and ionization of the evaporated KCl. Total ion yield spectra were recorded at photon energies from 8 to 30 eV in order to locate the excitation resonances and the ionization thresholds. Four clear resonance maxima were observed in the energy range of 19–23 eV well above the first ionization edges. Next the relaxation channels of these resonances were investigated. Time-of-flight (TOF) mass spectra were measured at and around the resonances in order to follow the change in the production of KCl-origin ions as a function of incident photon energy. Partial ion yield spectra for different ions and ion groups were also recorded for the comparison with the results of TOF mass spectra.
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