Doctoral Dissertations

Abstract

"Application of positive-ion energy-loss spectrometry has been extended to include experimental determination of absolute excitation cross sections of ground state helium ions. Helium ion-atom collisions were studied for impact energies ranging between 20-100 keV, in 10 keV intervals. The data were taken with an apparatus resolution between 0.6-o.8 eV FWHM. Cross sections for transitions from ground state to the second and third principal quantum levels of the ion plotted as a function of impact energy were still rapidly increasing at 100 keV. The cross sections at this energy were 1.64(± 0.28) x 10⁻¹⁸cm² for He⁺(l²s1/2) -> He⁺(n = 2) and 3.46(± 0.45) x 10⁻¹⁹cm² for He⁺(l²s1/2) -> He⁺(n = 3)"--Abstract, Page ii.

Advisor(s)

Park, John T.

Committee Member(s)

Bell, Robert John, 1934-
Dowell, Jerry T.
Nygaard, Kaare J.
Penico, Anthony J., 1923-2011
Lund, Louis H., 1919-1998

Department(s)

Physics

Degree Name

Ph. D. in Physics

Sponsor(s)

National Science Foundation (U.S.)
NDEA National Institute for Advanced Study in Teaching Disadvantaged Youth (U.S.)

Publisher

University of Missouri--Rolla

Publication Date

1970

Pagination

ix, 58 pages

Note about bibliography

Includes bibliographical references (pages 55-57).

Rights

© 1970 Donald Roy Schoonover, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Subject Headings

Helium ionsElectron energy loss spectroscopy

Thesis Number

T 2385

Print OCLC #

6020320

Electronic OCLC #

852793009

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