Measurements of Helium Excitation in Be+-He and Mg,+-He Collisions
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) x 10-18 cm2 at this velocity, as compared with a Mg+ (3s → 3p) cross section of (8.49±2.09) x 10-17 cm2.
E. Redd et al., "Measurements of Helium Excitation in Be+-He and Mg,+-He Collisions," Nuclear Inst. and Methods in Physics Research, B, vol. 24-25, no. PART 1, pp. 305-308, Elsevier, Apr 1987.
The definitive version is available at http://dx.doi.org/10.1016/0168-583X(87)90648-3
Keywords and Phrases
Helium; Ions; Physics - Atomic; Angular Differential Cross Sections; Quasi-one-electron (qoe) Collision Systems; Band Structure
International Standard Serial Number (ISSN)
Article - Journal
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