Abstract

When spectrophotometry is conducted in the presence of unavoidable stray radiation, the usual expression for the absorbance [A=log(100/T)] becomes log[(100−k)/(Tk)], where T is the percent transmittance (100I/I0) and k is the percent stray radiation. To meet the demands of routine infra-red spectrophotometry in the 15–22μ-region, a table of values of this function was prepared for 1<T<99 and 0.5<k<20. The calculation of these values was performed by punched card machines.

© 1950 Optical Society of America

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