University of Illinois Urbana-Champaign

The U center in potassium bromide crystals

Rockstad, Howard Kent

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Description

Title
The U center in potassium bromide crystals
Author(s)
Rockstad, Howard Kent
Issue Date
1964
Doctoral Committee Chair(s)
Maurer, R.J.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Date of Ingest
2011-05-19T14:34:07Z
Keyword(s)
  • U center
  • U band
  • potassium bromide crystals
  • secondary bands
  • exciton transitions
  • negative ion vacancy
  • interstitial hydride ion
Language
en
Abstract
The optical bleaching of the U band in potassium bromide crystals at 78°K has been investigated. The nature of the secondary bands, the U' and the Ul bands, was studied. The U' band consisted of component bands, including the a band which is due to exciton transitions near a negative ion vacancy. One component of the U' band is bleached readily in either of two ways: either by warming the crystal to lo6°K or by irradiating with monochromatic light in the Ul band. This component of the ut band was interpreted as due to exciton transitions near a negative ion vacancy perturbed by the proximity of a Ul center, that is, an interstitial hydride ion. The spectral distribution of quantum efficiency for conversion of U centers to negative ion vacancies at 78°K was measured and found to decrease by 4~ on the high energy side of the U band. The U band has a high energy shoulder and it is suggested that this high energy shoulder exhibits a lower quantum efficiency for the conversion than does the main U band.
Type of Resource
text
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http://hdl.handle.net/2142/23958
Copyright and License Information
1964 Howard Kent Rockstad

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Dissertations and Theses - Physics
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Graduate Theses and Dissertations at Illinois