Our study is designed to test whether or not existing 'charge transfer to the continuum' theory adequately explains the production of ci 2 U, electrons resulting from 0.2-0,s MeV H C and H: 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 (U, -vi). Although the cusp shaped peaks in both angle and energy are observed, (i) the /U, -~'~1 -l dependence predicted by all 'charge transfer into the continuum' theories is not found; furthermore, (ii) the predicted increase in cusp width when plotted in terms of (uea,) and as a function of E, is not found; finally (iii) it is confirmed that the yield of U, = ui electrons from H + bombardment is not the predicted E r 5 but rather very nearly an E,dependence through our energy range. Furthermore, the cusp widths associated with H + ions are considerably larger than those for equal velocity H i ions. Many of our observations may reflect solid state processes which occur prior to the time the ion passes through the foil surface into the vacuum.
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