J. Phys. IV France 09 (1999) Pr6-97-Pr6-100
Electron impact double ionization in magnesiumM.A. Coplan1, J.H. Moore2, J.W. Cooper1, J.P. Doering3 and B. El Marji3
1 Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742, U.S.A.
2 Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, U.S.A.
3 Department of Chemistry, The Johns Hopkins University, Baltimore, MD 27218, U.S.A.
Experimental investigations of double ionization provide information on the mechanism by which two electrons can be simultaneously removed from an atom. Information on the two-electron momentum distribution function of the electrons can also be obtained from the experiments. Results for the double ionization of magnesium are summarized and new (e,3e) data presented. Under a variety of experimental conditions evidence has been found for orientation and polarization effects. In addition, the recoil momentum of the residual doubly-charged ion is often large implying large momentum transfer to the core or ionizing collisions that occur close to the nucleus.
© EDP Sciences 1999