A zero-degree tandem electron spectrometer and rydberg analyzer for projectile electron studies in ion-atom collisions

Abstract

An electron spectrometer system consisting of a tandem 45° parallel-plate spectrometer preceded by a Rydberg analyzer has been developed to study projectile electron capture, ionization and excitation by 0° spectroscopy. This system has the ability to resolve a large number of excited and continuum atomic states of the projectile and has a low kinematic line broadening. High- n Rydberg electrons are field-ionized and decelerated in an inhomogeneous-field Rydberg analyzer. The field-ionized electrons are then energy-dispersed according to n-value. The design and performance of the system is presented with some results of continuum (cusp), Rydberg, Coster-Krönig and highly resolved ( ΔE/ E = 0.1–0.2%) K-Auger electrons for 0.5–1.75 MeV/amu, F q+ + He, Ne, H 2 collisions.