J. Phys. IV France
Volume 09, Numéro PR6, June 1999
International Conference on Coincidence Spectroscopy
Page(s) Pr6-195 - Pr6-198
International Conference on Coincidence Spectroscopy

J. Phys. IV France 09 (1999) Pr6-195-Pr6-198

DOI: 10.1051/jp4:1999643

Differential ionization measurements for electron and positron impact on atoms

R.D. DuBois

Department of Physics, University of Missouri Rolla, Rolla, MO 65401, U.S.A.

A progress report is presented on a new experimental program at the University of Missouri Rolla which is investigating the dynamics of inelastic lepton-atom collisions. By employing recoil ion momentum spectroscopie techniques, differential ionization cross sections are being studied for electron-atom and positron-atom collisions in the energy range from 50 to 1000 eV. The apparatus is configured to measure the transverse and longitudinal momentum components of the recoil target ion and of the ejected electrons. In addition, projectile scattering into θ and φ angles up to 20 degrees can be measured. The goal is to study isotachic electron and positron impact in order to investigate charge effects on the interaction dynamics. In addition, by comparing these data with existing proton impact data, mass effects can be investigated. A summary of progress to date and experiments planned for the near future are given.

© EDP Sciences 1999