Mass Spectrometric Study of Ionndash;Neutral Reactions in Radiohyphen;Frequency Discharges in Carbon Dioxide

摘要

Abundances of positive ions and neutral molecules emanating from an active radiohyphen;frequency discharge in CO2at pressures from 0.01 to 1 torr have been determined mass spectrometrically. The data are used to evaluate rate constants for ionndash;neutral reactions occuring in the discharge. The results are in agreement with previous results for reactions occuring in an electronhyphen;impact ion source and in thermalized flowing afterglows. The large yield of O2plus;at the higher discharge pressures is attributed mainly to charge transfer to O2, the extent of which is enhanced by the long retention (and hence reaction) time resulting from the low mobility of CO2plus;at the higher pressures.