Degree Type

Dissertation

Date of Award

1990

Degree Name

Doctor of Philosophy

Department

Chemistry

First Advisor

Gerald J. Small

Abstract

Results of an extensive study, covering burn intensities in the nW to [mu]W/cm[superscript]2 range, of dispersive hole growth kinetics are reported for Oxazine 720 in glycerol glasses and polyvinyl alcohol polymer films and their deuterated analogues. A theoretical model which employs a distribution function for the hole burning rate constant based upon a Gaussian distribution for the tunnel parameter is shown to accurately describe the kinetic data. This model incorporates, for the first time, the linear electron-phonon coupling. A method for calculating the nonphotochemical quantum yield is presented which utilizes the Gaussian distribution of tunnel parameters. The quantum yield calculation can be extended to determine a quantum yield as a function of hole depth. Deuteration of the host hydroxyl protons reduces the hole burning quantum yield by ≈ 20, indicating that large amplitude motion of the proton is an important component of the tunneling coordinate. The effect of spontaneous hole filling is shown to be insignificant over the burn intensity range studied. Average relaxation rates for hole burning are ~8 orders of magnitude greater than for hole filling. The dispersive kinetics of hole burning are observed to be independent over the temperature range of these experiments, 1.6 to 7.0 K. ftn*DOE Report IS-T 1374. This work was performed under Contract No. W-7405-ENG-82 with the U.S. Department of Energy.

DOI

https://doi.org/10.31274/rtd-180813-12762

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Michael Joseph Kenney

Language

en

Proquest ID

AAI9110515

File Format

application/pdf

File Size

118 pages

Share

COinS