Abstract
A greater understanding of the mechanism of the collision induced dissociation of ions at low energies (1–100 eV) is important in the application of triple quadrupoles to analytical problems. A well designed triple quadrupole (ref.1) can itself be used to make quantitative measurements of (a) the kinetics of dissociation, which allow cross-sections to be estimated (b) the variations in ion yields with collision energy and the determination of threshold energies for dissociation and (c) the fragment in energy distributions which give information about the scattering angles involved. Illustrations are given for the dissociation of (H 2O) nH +, C 2H 5OH 2 +, C 6H 6 + and C 10H 14 + in collision with many different target gases, both monatomic and polyatomic. It is shown that by using collisions, energy can be deposited in polyatomic ions in a controlled manner. This adds another facet to the application of MS/MS techniques.
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