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
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