ESR AND OPTICAL ABSORPTION STUDIES OF TRANSITION METAL IONS AND COLOR CENTERS IN GLASS
Semiannual technical rept. no. 1, 1 Oct 1966-31 Mar 1967
AMERICAN OPTICAL CORP SOUTHBRIDGE MA RESEARCH DIV
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The theory of zero field ESR measurements of an S 32 system is considered, including spectrometer considerations. A brief discussion of an experimental problem associated with temperature dependent ESR intensity measurements of broad powder spectra is included along with a proposed solution. The optical absorption and ESR spectra of Mo5 and Cu2 in glass, in the concentration range 0.1-16.0 wt. MoO3 and CuO, respectively, were investigated. In both cases, the ESR spectra are round to be concentration dependent. For isolated Cu2, the axial spin Hamiltonian parameters obtained are g parallel to 2.335 plus or minus 0.002, g perpendicular to 2.050 plus or minus 0.001, A parallel to 155 plus or minus 1 x 0.0001cm, and A perpendicular to 22.7 plus or minus 0.1 x 0.0001cm. ESR and optical absorption spectra of Mo3 in a phosphate glass are shown. The value of the crystal field splitting parameter delta is 22,000cm, about 52 greater than the value of 14,500cm for isoelectronic Cr3 in the same base glass. The spin resonance spectra of Cr3 and Mo3 are compared, from which it is concluded that they are similarly accommodated in the glass. Their local environments appear to be identical. A technique is described which allows for a precise determination of the activation spectrum for production of permanent color center defects by ultraviolet light.
- Lasers and Masers
- Ceramics, Refractories and Glass