Abstract
Absolute total electron impact ionization cross-sections have been measured for CO,CO2, OCSand CS2 from near threshold to 250 eV. Experimental data are compared with previously reportedmeasurements and with calculations using the additivity method of Margreiter, Deutschand Märk (DM) and the binary encounter Bethe method (BEB). Bond components to thetotal cross-section, previously deduced from systematic studies of perfluorocarbons, mixedhalocarbons, nitriles, chlorocarbons and alcohols, have been shown to reproduce andpredict maximum electron impact cross-sections to a high level of confidence.C = O and C = S bond cross-sections are now reported from the maximum cross-sections forCO2 andCS2, andshown to predict the measured maximum ionization cross-section for OCS to within 4%. The data for OCSand CS2 are shown to be in good accord with the expectations of previously derived relationshipsbetween the maximum ionization cross-section, the molecular volume polarizability and themolecular ion appearance energy (ionization threshold energy).
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