Strong dependence of zero degree binary encounter electron production on the initial and final charge state

Abstract

Doubly differential cross sections d2v/dEE dCl. and fractional probabilities for binary encounter (BE) electron emission at 0" electron emission angle as a function of initial ( 4 , ) and final (4,) projectile charge state have been measured for 0.53 MeV"-' F' , on H,. The data confirm the surprising decrease of the panial cross section with increasing charge state of the incoming projectile q, reponed by Richard el al. We show by coincident electron projectile detection that the pure ionization channel q, = q, strongly dominates the differential cross section at 8.=0' and projectile capture and loss channels are of negligible imponance.In view of a recent calculation by Olson el 01 we conclude from our data that 0' BE electron emission depends strongly on the shape of the screened projectile potential varying with qi.

Angular distribution of δ electrons emitted in collisions of 1.0-MeV/uFq+(q=4,6,8,9) with molecular hydrogen

“…This result was also confirmed in electron-projectile coincidence experiments [7,8], where the pure target ionization channel was selected.…”