Abstract
The paper describes how a collision gas cell that can be floated at an electrical potential remote from ground can be used to investigate collision-induced reactions even if the cross-section for collision is very small. Three examples of the use of the method are given for reactions for which it has not previously been possible to demonstrate collision sensitivity. The reactions are the climination of HCN from the molecular ion of benzonitrile, the fragmentation of benzene doubly-charged molecular ions and the fragmentation of 91 2+ ions from toluene. In the last of these examples, where the 39 + product ions are believed to be formed with two different structures, it is shown that the abundance of the propargyl positive ions formed increases more rapidly as a function of collision gas pressure than the abundance of the isomeric cyclopropenyl ions.
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