Abstract

On the basis of transmission measurements of samples at temperatures near the melting point, we have determined the Lambert absorption coefficient α(ν) for solid ammonia in the spectral range 950–5300 cm−1. The imaginary part k of the complex index of refraction Nˆ=n+ik can be obtained from the defining relation k(ν) = λα(ν)/4π. Using the measured values of α(ν), we have employed subtractive Kramers–Kronig analysis to obtain the real part n(ν) of Nˆ in the range 960–5300 cm−1. In this analysis, we have used a computed value n(ν) at 4800 cm−1 based on a Lorentz–Lorenz relation and the value of n(ν) for liquid ammonia that we measured previously. The resulting optical constants k(ν) and n(ν) for solid ammonia are presented graphically and tabularly.

© 1975 Optical Society of America

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