Title

Measurements of Helium Excitation in Be+-He and Mg,+-He Collisions

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) 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.

Department(s)

Physics

Keywords and Phrases

Helium; Ions; Physics - Atomic; Angular Differential Cross Sections; Quasi-one-electron (qoe) Collision Systems; Band Structure

International Standard Serial Number (ISSN)

0168583X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1987 Elsevier, All rights reserved.

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