An Experimental Apparatus for Studying Differential Scattering of Multiply-Charged Ions from Neutral Targets Following Capture

Author

John Edward Edens, Western Michigan University

Date of Award

4-1995

Degree Name

Master of Arts

Department

Physics

First Advisor

Dr. E. Y. Kamber

Second Advisor

Dr. J. A. Tanis

Third Advisor

Dr. S. M Ferguson

Access Setting

Masters Thesis-Open Access

Abstract

An experimental apparatus has been designed, enabling measurement of angular differential cross sections for single-electron capture (SEC). The design consists of a microchannel plate detector with a one-dimensional position sensitive anode. A bow-time shaped aperture was employed to convert a radially scattered distribution into an approximate linear one. An electrostatic retarding grid was used to separate SEC contributions from the reaction products. Measurements were made of the angular differential cross sections for SEC of Ar^q+ (q=4-6,8) ions scattering from He and Ar at impact energies of 600 to 3000 eV and angles between 0 and 23 mrad. The experimental angular spectra contain a main peak lying near a critical angle, Θ_c, the crossing radius of the active channel. The results for Ar⁶⁺ and Ar⁸⁺ on He and Ar are in qualitative agreement with calculations made using a semiclassical model based upon classical differential cross sections coupled with Landau-Zener transition probabilities.

Recommended Citation

Edens, John Edward, "An Experimental Apparatus for Studying Differential Scattering of Multiply-Charged Ions from Neutral Targets Following Capture" (1995). Masters Theses. 4272.
https://scholarworks.wmich.edu/masters_theses/4272