A New Apparatus for Studying Excitation in Ion-Atom Collisions at Low Energy Using the Ion-Photon Coincidence Method

Abstract
A new apparatus is described whose purpose is the study of ion‐atom excitation processes. A single photon emitted by the excited target atom is detected in coincidence with the ion scattered at a given angle. Preliminary results are given for the He+–He collision at 300 eV and scattering angle from 6 to 15° with excitation of the 33P state and emission of the 33P−23S line (3889 Å).