OPTICAL CONSTANTS OF WATER IN THE INFRARED

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Date

1972

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Ohio State University

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The real and imaginary parts of the refractive index of water have been determined in the 5000 -- 350 $cm^{-1}$ region by several techniques. The first involves measurements of the spectral reflectance of polarized radiation at two oblique angles of incidence with $n_{r}$ and $n_{i}$ determined from the Fresnel $equations.^{1}$ The second involves the measurement of spectral reflectance at near-normal incidence and at Brewster’s $angle.^{2}$ The third involves measurements of reflectance at near-normal incidence and accurate measurement of the Lambert absorption $coefficient.^{3}$ The fourth method involves the Kramers-Kroning analysis of near-normal reflectance $measurements.^{4}$ The results obtained by the various methods will be compared. The results provide measures of the absolute intensities of the major absorption bands of water. Supported in part by the office of Naval Research

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$^{1}$M.R.Query,B.Curnutte,and D.Williams, J.Opt. Soc. Am.59, 1299(1969) $^{2}$A.N.Rusk, D. Williams, and M.R.Qrerry, J.Opt. Soc. Am.61, 895 (1971). $^{3}$C.W.Robertson and D.Williams, J.Opt. Soc. Am.61,1316 (1971). $^{4}$G.M.Hale, M.R.Querry,A. N.Rusk, and D.Williams,J.Opt. Soc. Am. (In Press).""
Author Institution: Department of Physics, Kansas State University Manhattan

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