CLASSICAL DISPERSION ANALYSIS OF SODIUM CHLORATE INFRARED REFLECTANCE BANDS
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Date
1966
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Ohio State University
Abstract
$Recently^{1, 2}$ careful normal incidence reflectance measurements were carried out at room temperature on a single crystal of $NaClO_{3}$ in the region of $400 cm^{-1}$ to $2300 cm^{-1}$. In applying an improved Kramers-Kronig dispersion analysis $procedure^{2}$ the imaginary dielectric index spectrum of the internal modes appeared to correspond, qualitatively at least, to a system of essentially harmonic $bands^{1}$. The problem of harmonicity of the bands has been examined now more critically through classical dispersion $analysis^{4}$. With this approach it has been found that the $\nu_{4}, \nu_{2}$, and $\nu_{1}$ bands have frequency independent damping constants, whereas the degenerate $\nu_{3a}$ and $\nu_{3b}$ do not; consequently, the $\nu_{3b,3a}$ bands may be considered to be anharmonic. Reasonably close agreement has been observed for the imaginary dielectric constant spectrum of the degenerate modes between the Kramers-Kronig and the frequency dependent classical dispersion values. Supported in part by the National Science Foundation. Permanent address of L. Reed Brantley: Department of Chemistry, Occidental College, Los Angeles, Calif.
Description
$^{1}$ G. Andermann, Ph.D. Thesis 1965, University of Southern California. $^{2}$ G. Andermann, A. Caron, and D. A. Dows, J. Opt. Soc. Am. 55, 1210 (1965). $^{3}$ G. Andermann, and D. A. Dows, Submitted for publication in J. Phys. Chem. Solids. $^{4}$ R. C. Miller, and W. G. Spitzer, Phys. Rev. 129, 94 (1963).
Author Institution: Department of Chemistry and Hawaii Institute of Geophysics, University of Hawaii; Department of Chemistry, University of Hawaii
Author Institution: Department of Chemistry and Hawaii Institute of Geophysics, University of Hawaii; Department of Chemistry, University of Hawaii