Do present 'charge transfer to the continuum' theories correctly describe the production of vi=veelectrons in ion beam-foil collisions?

The authors' study is designed to test whether or not existing 'charge transfer to the continuum' theory adequately explains the production of viapproximately=veelectrons resulting from 0.2-0.5 MeV H+and H2+ion bombardment of thin carbon foils; the work suggests that it does not. The differential energy and angular distributions of the emitted electrons are discussed in terms of the vectorial electron-ion velocity differences (ve-vi). Although the cusp shaped peaks in both angle and energy are observed, (i) the mod ve-vimod-1dependence predicted by all 'charge transfer into continuum' theories is not found; furthermore, (ii) the predicted increase in cusp width when plotted in terms of (ve-vi) and as a function of Eiis not found; finally (iii) it is confirmed that the yield of veapproximately=vielectrons from H+bombardment is not the predicted Ei-5but rather very nearly an Ei-3dependence through the energy range. Furthermore, the cusp widths associated with H+ions are considerably larger than those for equal velocity H2+ions.