Small-Angle Charge Exchange inHe++N2Collisions

Small-angle charge-exchange measurements are made on the ${\mathrm{He}}^{+}$ + ${\mathrm{N}}_2$ collision in an energy range from 0.50 to 3.00 keV and in an angular region out to 2.0°. The experimental results directly show that charge exchange plays a major role in the collision. At each energy the probability of charge exchange increases monotonically with increasing angle of scattering and then attains a relatively constant value with further increase in angle.