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This paper examines two aspects of an experimental technique designed to investigate the dependence of ion-molecule specific reaction rates on primary ion energy. In this experiment the reaction proceeds in a mass spectrometer ion source under a constant electric field, and the ratio of secondary to primary ions is recorded as a function of time.

The Effects of Thermal Energy and Ion-Removal Time on the "Pulsed Source" Method for Mass Spectrometer Investigations of Ion?Molecule Reactions