SCATTERING STUDY OF SINGLE CHARGE-TRANSFER IN -LESS-THAN-OR-EQUAL-TO-Q-LESS-THAN-OR-EQUAL-TO-14) ON AR COLLISIONS AT 72Q-EV( (11)

Collisions of highly charged Ar-q+ ions (11 less than or equal to q le ss than or equal to 14) with neutral Ar were investigated at 72q eV la boratory energy. Energy gain spectra were measured at different scatte ring angles, and relative doubly differential cross sections for the A r-(q-1+) product were obtained. Odd charge state projectiles are scatt ered with an energy gain corresponding to a narrow range of Q values, while even charge state projectiles are scattered with energy gains as sociated with three different groups of Q values. This even-odd variat ion with projectile charge state seems to be a general feature of Ar-q + on Ar scattering, but no explanation for this effect is offered at t his time. Energy gain spectra measured at different scattering angles were integrated over scattering angles, and the resulting function, pr oportional to the Q value distribution function, reflects the density of capture states.