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
Subject Headings
Thallium
Thesis Number
T 2143
Print OCLC #
5998759
Electronic OCLC #
806295656
Link to Catalog Record
Recommended Citation
Pickett, Robert Charles, "The lifetime and effective quenching cross section of the 6²P₃/₂ state of thallium" (1968). Doctoral Dissertations. 1979.
https://scholarsmine.mst.edu/doctoral_dissertations/1979