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1964 Howard Kent Rockstad U center U band potassium bromide crystals secondary bands exciton transitions Maurer, R.J. Rockstad, Howard Kent 2011-05-19T14:34:07Z 2011-05-19T14:34:07Z 10000-01-01 1964 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. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-05-19T14:34:07Z No. of bitstreams: 1 1964_rockstad.pdf: 4812644 bytes, checksum: 7da0842d6f5a84e7fbfcdfb1fb68c9ec (MD5) Made available in DSpace on 2011-05-19T14:34:07Z (GMT). No. of bitstreams: 1 1964_rockstad.pdf: 4812644 bytes, checksum: 7da0842d6f5a84e7fbfcdfb1fb68c9ec (MD5) Previous issue date: 1964 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-05-19T14:34:07Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:12:53-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 6141334 http://hdl.handle.net/2142/23958 en negative ion vacancy interstitial hydride ion The U center in potassium bromide crystals Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.