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Temperature Measurement by Observation of the Raman Spectrum of Diamond
Volume 46, Number 2 (Feb. 1992) Page 375-377
Dai, Sheng; Young, J.P.; Begun, G.M.; Mamantov, Gleb
In designing a fiber-optic probe to use for Raman spectral measurements in a fused salt melt at temperatures in the range 500 to 900°C, we were led to the possible use of a diamond window to aid resistance to corrosion. Diamond (space group Fd3m) with 2 atoms per Bravais unit cell, possesses one triply degenerate first-order lattice phonon with symmetry, F2g, which is Raman active. The resulting Raman line occurs at 1332 cm−1 at room temperature; the line is sharp and well separated from the lower-frequency area where the Raman spectrum of other melt species would be observed. Studies of the Raman spectra of diamond as a function of temperature have previously been reported. Stokes/anti-Stokes ratio, shift, and width of the Raman spectrum of diamond have been reported by Herchen and Cappellli and by Anastassakis et al. These studies were carried out to better characterize the physical properties of diamond. Considering the fact that Stokes and anti-Stokes intensities could be measured concurrently with the spectra of the melt species, we thought the diamond Raman line might also be used to make an in situ temperature measurement for this and other systems.