Abstract
The use of variable low energy collision-induced dissociation to probe the energy dependence of the fragmentation of gaseous anions and, thus, to probe the potential energy surfaces involved, is illustrated using R(CH3)2CO- ions as an example. The fragmentation of proton-bound cluster ions [RO--H--OR’]- is discussed and it is shown that the relative intensities of RO- and R’O- can be related to the relative gas phase acidities of the alcohols ROH and R’OH. The use of both high energy and low energy collisional methods in confirming the structures of gaseous anions and in differentiating isomeric neutral structures is illustrated. It is shown that, for small anions at least, low energy collisional activation provides more certain structural information than high energy collisional activation.
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