MEASURED AND CALCULATED DOUBLE-IONIZATION ENERGIES OF THE CHLOROFLUOROETHANE MOLECULES CF3CF2CL, CF3CFCL2, CF3CCL3, CF2CLCF2CL, CF2CLCFCL2,CF2CLCCL3, CFCL2CFCL2 AND CFCL2CCL3

The double-ionization energies of the eight chlorofluoroethane molecul es have been measured by double-charge-transfer spectrometry. Several peaks were observed in most of the spectra giving information about th e energies required to populate electronically excited states (or grou ps of states) of the dications as well as those to the ground states. In addition to the experimental study, the vertical double-ionization energies to the lowest triplet levels of the dications were calculated . In general, the calculated values are lower than those determined ex perimentally, but the addition of a uniform shift of 0.4 eV to them br ings all calculated data to within +/- 0.7 eV of those measured. This agreement is quite good since the uncertainty associated with the meas ured double-ionization energies to the ground states is +/- 0.5 eV.