Angular differential cross sections for the excitation of 1¹S helium to the 2¹S and 2¹P states by 25- to 100-keV proton impact

Author

• Thomas Jay Kvale

Abstract

"Angular differential cross sections for the proton impact excitation of ground state helium (1¹S) to the 2¹S and 2¹P states have been measured for the first time in the energy range 25- to 100-keV using the energy-loss technique. The present data have been numerically summed over the 2¹Sand 2¹P states to produce differential cross sections for excitation to the composite n=2 state and are in excellent agreement with previous experimental measurements of that process. Total cross sections have been obtained by numerically integrating the present data over scattering angle. and these results also compare favorably with previous absolute experimental measurements.

The theoretical predictions for the 2¹S differential cross sections are in general disagreement with the experimentally determined cross sections. The agreement of the theories with the data is generally satisfactory for the 2¹P cross sections. however there 1s still disagreement at 25 keV for this process as well. The agreement of theory with experiment generally improves with increasing impact energy. It appears that the distortion coupling of the states during the collision is an important process for excitation in this system"-- Abstract, p. iii

Advisor(s)

Park, John T.

Committee Member(s)

Bell, Robert John, 1934-
Peacher, Jerry
Schearer, Laird D., -1993
Penico, Anthony J., 1923-2011

Department(s)

Physics

Degree Name

Ph. D. in Physics

Publisher

University of Missouri--Rolla

Publication Date

Spring 1984

Journal article titles appearing in thesis/dissertation

This Dissertation has been prepared under the guidelines established in the current edition of the "AIP Style Manual'' (ed. 1978) for publication in the Physical Review journal. Pages 1 through 131 will be submitted. with abbreviations for compactness. to Physical Review for publication in Physical Review A.

Pagination

x, 132 pages

Note about bibliography

Includes bibliographical references (pages 126-131)

Rights

© 1984 Thomas Jay Kvale, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 5062

Print OCLC #

11694464

Recommended Citation

Kvale, Thomas Jay, "Angular differential cross sections for the excitation of 1¹S helium to the 2¹S and 2¹P states by 25- to 100-keV proton impact" (1984). Doctoral Dissertations. 552.
https://scholarsmine.mst.edu/doctoral_dissertations/552