An experimental apparatus for investigating lowhyphen;collision energy gashyphen;phase reactions of highly charged ions with atoms and molecules by anglehyphen;resolved translational energy spectroscopy is described. The basic function of the apparatus is to slow down highly charged ions extracted at 2ndash;3 kV from the Cornell superconducting solenoid, cryogenic electron beam ion source (CEBIS) to energies below 100 qeV. The slowing down and monochromatization of the beam is done by an ion optical system that consists of two 180deg; hemispherical electrostatic analyzers with a tuneable deceleration lens located between them. The lowhyphen;energy beam available for experiments has an angular spread of 0.5deg; and an energy spread of 0.4 qeV. The ion optical system is mounted on a 508 mm by 576 mm electrically isolated platform inside a large vacuum chamber, and the modular nature of the apparatus allows for quick and easy rearrangement of the ion optical elements for different experiments. A brief overview of inhyphen;plane scattering kinematics is given.
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