Negative ion mass spectrometry. Part 2.1—Ionization processes in 2- and 3-nitrotoluene

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.