Abstract

Translational-energy spectroscopy (TES) has been widely employed over the last 30 yr to characterize the collision-induced and unimolecular reactions of ions. A personal view is taken of the breath of the field and some of the landmark events that have helped shape it. In this article, the description of the technique is confined to applications for ion beams with translational energies from 0.1 to 10 keV and those not relying on the absorption or emission of radiation. Collisions of ions with a neutral target gas can reveal spectroscopic information on the states of the participating species, dynamics of the collision, lifetimes of species, collision cross sections, and populations of states. The work from six key laboratories is included to illustrate the range of applications.

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