Abstract
Essential design and construction details and some preliminary results are given for a new tandem mass spectrometer which was designed for the study of low (approximately thermal) energy ion-molecule reactions. The first stage of the instrument consists of a 180 degree, 5.7 cm radius magnetic mass spectrometer which provides a beam of mass analyzed reactant ions. The second stage of the instrument consists of a deceleration lens and an ion cyclotron resonance mass spectrometer. A moderately high pressure source in the first stage of the instrument permits studies of reactant ions which are themselves products of ion-molecule reactions. Differential pumping isolates the ion source from the collision region and therefore permits detailed studies of internal energy effects on ion-molecule reactions.
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