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1968 Borders, James Alan 2011-07-11T14:09:27Z 2011-07-11T14:09:27Z 10000-01-01 Brown, Frederick C. A new technique was developed for making measurements on highly insulating photoconductors. This technique features ease of data reduction, relative freedom from space charge polarization, and higher sensitivity and stability than that of previous designs. Using the new method, measurements were made of Hall effect, hot electron effects and magnetoconductivity in a variety of ionic crystals. The conduction bands of seven alkali halides were found to be isotropic with a measuring accuracy of ± 0.5%. Cyclotron resonance of photocarriers was observed at 139 GHz by electron heating effects. Polaron effective masses were measured in a variety of materials and the results compared with previous experiments and theory. In addition, transport effects due to spin polarization were qualitatively identified in colored potassium halides. These effects have been attributed to spin polarization of the F centers along with the conduction electrons. They have been analyzed using a simplified model. Preliminary measurements of spectral response of photoconductivity in AgBr have been made and the results compared with optical absorption. Structure has been found which may be related to the presence of minute traces of impurity such as iodine. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-11T14:09:27Z No. of bitstreams: 1 1968_borders.pdf: 2360575 bytes, checksum: cef820a497f4f7a9c0eefc276183068c (MD5) Made available in DSpace on 2011-07-11T14:09:27Z (GMT). No. of bitstreams: 1 1968_borders.pdf: 2360575 bytes, checksum: cef820a497f4f7a9c0eefc276183068c (MD5) Previous issue date: 1968 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-11T14:09:27Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:32:53-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 6082730 http://hdl.handle.net/2142/25744 en 1968 James Alan Borders polaron transport ionic crystals highly insulating photoconductors space charge polarization Polaron transport in ionic crystals Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.