1. presented at this Conference 7th Int. Conf. on Ion Implantation Technology;Keenan,1988
2. these Proceedings 7th Int. Conf. on Ion Implantation Technology;Felch,1989
3. Silicon Valley Implant Users Group, NCC AVS, Box 1169, Livermore, CA 94550 USA.
4. Wafer charging and beam interactions in ion implantation