Estle, Thomas L.2018-12-182018-12-181978Hoffman, John Russell. "Electric-field-effect and low temperature EPR studies of BaF₂¿:Mn++ and SrF₂¿:Mn++ crystals." (1978) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/104046">https://hdl.handle.net/1911/104046</a>.https://hdl.handle.net/1911/104046Text includes handwritten formulasSubstituted Mn centers were studied in BaF2 and SrF2 crystals for possible off-center character. The angular dependence of the EPR spectra on the magnetic field direction was obtained at 1.3K and 4.2K in {11} crystal planes. Static electric fields up to 9 kV/cm were also applied along <111> and <1> at 4.2K and along <111> at 77K while taking EPR spectra. The EPR of SrF2:Mn++ was studied with similar electric fields along <111> directions at 4.2K. The splitting of EPR lines of a ruby crystal under an applied electric field demonstrated the experimental set-up functioned adequately. All spectra obtained for BaF2:Mn++ and SrF2:Mn++ showed no fine structure and were isotropic. The Mn appears to not be offcenter, but to have octahedral (h) site symmetry in these crystals.127 ppengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.ThesisRICE1672reformatted digitalThesis Phys. 1978 Hoffman