Negative Ion Mass Spectrometry: Part 2?—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.