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

Author

E. Redd
Timothy Gay
D. M. Blankenship
John T. Park, Missouri University of Science and TechnologyFollow
Jerry Peacher, Missouri University of Science and TechnologyFollow
Denver G. Seely

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.

Recommended Citation

E. Redd et al., "Measurements of Helium Excitation in Be⁺-He and Mg,⁺-He Collisions," Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, vol. 24-25, no. PART 1, pp. 305 - 308, Elsevier, Apr 1987.

The definitive version is available at https://doi.org/10.1016/0168-583X(87)90648-3

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)

0168-583X

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1987 Elsevier, All rights reserved.

Publication Date

01 Apr 1987