Doctoral Dissertations

Abstract

Differential cross sections Ear excitation of atomic hydrogen to its n = 2 level by 15-100 keV He+ ions have been determined for cm. angles from Oto 8 m rad. The cross sections were obtained from an analysis of the angular distribution of the scattered ions which had lost an energy corresponding to the excitation of the target to its n= 2 level. The shape of the differential cross section changes rapidly with increasing incident energy. At 15 keV, the cross section falls off by a factor of 5 in 6 m rad. At 100 keV, the cross section decreases by nearly six orders of magnitude in the same angular range. The middle and high energy results are in good agreement with a recent Glauber approximation calculation for the scattering. Comparison of the present reduced cross section results with those at lower energy (0.75-1.5 keV) indicates that the collision mechanism is not the same. Excitation to n ≥ J levels was clearly present in the energy-loss spectra for the process in contradiction to the molecular orbital description of the mechanism. Total cross section results are given for the same scattering process in the 15-200 keV range and are also in good agreement with the Glauber and VPSA theory results. The experimental and Glauber differential results, however, are clearly different at 25 keV"-- Abstract, p. iii

Advisor(s)

Park, John T.

Committee Member(s)

Anderson, Richard A.
Hale, Edward Boyd
Pursell, Lyle E.
Peacher, Jerry

Department(s)

Physics

Degree Name

Ph. D. in Physics

Publisher

University of Missouri--Rolla

Publication Date

Spring 1980

Pagination

x, 249 pages

Note about bibliography

Includes bibliographical references (pages 53-55)

Rights

© 1980 John Eldon Aldag, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 4507

Print OCLC #

7565610

Download

Included in

Physics Commons

Share

 
COinS