Abstract
Values for the vertical ionization energies of ions from ethane have been determined by charge stripping high-velocity ions with nitrogen collision gas and measuring the value of Q min, the minimum translational energy loss. The ionization energy IE (m + → m 2+) can be measured directly for processes in which the product m 2+ ions are sufficiently stable to reach the ion collector. This is the case for C 2H 5 2+·, C 2H 4 2+, C 2H 3 2+·, C 2H 2 2+ and C 2H 2+·. Ions C 2H 6 2+ are, however, unstable and fragment to give C 2H 5 2+· ions among the products. The translational energy of these product ions can be used to determine IE (C 2H 6 +· → C 2H 6 2+). Measurements were also obtained on all the singly-charged ions from pentadeuteroethane. In this case, the ion kinetic energy spectrum of C 2HD 5 +· showed a peak due to the process C 2HD 5 +· → (C 2HD 5 2+) → C 2HD 3 2+. The position of this peak enabled a value for IE (C 2HD 5 +· → C 2HD 5 2+) to be calculated. The values obtained from the pentadeutero compound confirmed those from ethane.
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