Doctoral Dissertations

Abstract

"The measurement of the lifetime of the metastable 6²P₃/₂ state of thallium is discussed. Measurement of time varying optical absorption by time sampling techniques is explained for the study of the decay of the metastable atom concentration following a pulsed radio frequency discharge. The decay of the thallium radiation from optically allowed states terminating on the metastable state is measured at nine different thallium densities in the afterglow of the discharge. This radiation repopulates the metastable state and is displayed on an oscilloscope. The metastable lifetime is measured as a function of the thallium density at three different r-f power levels and by two modes of operation. At high thallium densities where thallium collisions control the diffusion of the metastable atoms, the lifetime measurements yielded a thallium diffusion cross section for the 6²P₃/₂ state of 100 ± 30 c 10 ⁻¹⁶ cm² and an effective self quenching cross section of 5.4 ± 0.5 x 10⁻¹⁶ cm²"--page [i].

Advisor(s)

Anderson, Richard A.

Committee Member(s)

Rivers, Jack L.
Eidson, William W.
Carson, Ralph S.
Antle, Charles E.
McFarland, Charles E.

Department(s)

Physics

Degree Name

Ph. D. in Physics

Publisher

University of Missouri--Rolla

Publication Date

1968

Pagination

v, 49 pages

Note about bibliography

Includes bibliographical references (pages 47-48).

Rights

© 1968 Robert Charles Pickett, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Thallium

Thesis Number

T 2143

Print OCLC #

5998759

Electronic OCLC #

806295656

Included in

Physics Commons

Share

 
COinS