Abstract
We have observed level specific excitation of He( n = 2, 3) in collisions of Be + and Mg + with He at projectile velocities of 1 2 a.u. With both Be + and Mg + projectiles, excitation for small scattering angles (large impact parameters) is appreciable, indicating the occurrence of “direct” excitation. Angular differential excitation cross sections were measured with Mg + projectiles at c.m. angles up to 9.6 mrad (11.7 keV deg). “Molecular” excitation begins to dominate these cross sections at about 1.8 keV deg or b ≈ 1.5 a.u.. The total He( n = 2) excitation cross section is (6.86±0.38) × 10 −18 cm 2 at this velocity, as compared with a Mg + (3s → 3p) cross section of (8.49±2.09) × 10 −17 cm 2.
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