Abstract

An accessory has been designed for the Cary recording spectrophotometers which records on a 3- or a 5-decade semilog chart the absorptivity of the sample while the spectrophotometer is recording the absorbance of a dilution of the sample. The product of sample concentration and cell length for each dilution is set into a Veeder counter coupled to a simple analog computer that converts the observed absorbance to absorptivity. One or more curve segments of absorptivity vs wavelength are obtained for each dilution of the sample. The composite of all the segments obtained from a series of dilutions yields a continuous spectrum over the desired wavelength interval.

This accessory greatly facilitates the interpretation of an unknown spectrum or the intercomparison of a series of related spectra. It can also be used for obtaining reference spectra of pure compounds.

© 1960 Optical Society of America

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