Abstract:
Ionization efficiency curves (profiles) have been recorded for parent and major daughter negative
ions from 2- and 3-nitrotoluene. From the effects of adding sulphur hexafluoride as a thermal
electron scavenger it is concluded that slow electron capture is a major process in the formation of
both parent and fragmentation product ions. The conditions obtaining within a negative ion source
operating with 70 eV electrons are discussed.