Photoionization of laser excited barium

Author

Lucy-Wenzhong He

Abstract

"Absolute cross sections for photoionization of the 6s6p ¹P excited state of barium were measured over the range 420 - 368 nm. This range includes threshold as well as numerous autoionizing resonances resulting from excitation to discrete states embedded in the ionization continuum. The experiments were motivated by a need to compare theoretically determined cross sections with experimentally determined ones for the purpose of evaluating the efficacy of the theoretical techniques employed. Moreover, discrepancies between theory and earlier experimental results were resolved by the work carried out for this dissertation. The results are now in essential agreement with the theory. The experiments were performed using an atomic beam apparatus and two lasers. One laser beam, of fixed wavelength, excited ground state barium atoms to the 6s6p ¹P state while the other, of variable wavelength, was used to ionize these atoms. Several different combinations of polarizations of the laser light were employed so that, in conjunction with angular momentum algebra, the cross sections for photoionization to specific final J-states could be determined. These state-to-state determinations are the first reported and thus test the theory at a more fundamental level than ever before"--Abstract, page iii.

Advisor(s)

Leventhal, Jacob J. (Jacob Joseph), 1937-

Committee Member(s)

Peacher, Jerry
Manson, Steven T.
Schwartz, Alan L.
Burkhardt, Charles E.
Park, John T.
Olson, Ronald E.

Department(s)

Physics

Degree Name

Ph. D. in Physics

Comments

Dissertation completed as part of a cooperative degree program with the University of Missouri--Rolla and the University of Missouri--St. Louis.

Publisher

University of Missouri--Rolla

Publication Date

Fall 1994

Pagination

viii, 83 pages

Note about bibliography

Includes bibliographical references (pages 79-80).

Rights

© 1994 Lucy-Wenzhong He, All rights reserved.

Document Type

Dissertation - Citation

File Type

text

Language

English

Subject Headings

BariumPhotoionization

Thesis Number

T 6914

Print OCLC #

33212651

Recommended Citation

He, Lucy-Wenzhong, "Photoionization of laser excited barium" (1994). Doctoral Dissertations. 1056.
https://scholarsmine.mst.edu/doctoral_dissertations/1056