The Calibration of an Infrared Spectrometer with a Rocksalt Prism

Abstract

The dispersion data for rocksalt originally determined by Paschen are corrected to 25°C with the use of temperature coefficients derived from the measurements of Liebreich. Values of the angle of minimum deviation of a 60° prism and the prism table angles from the sodium D lines for a spectrometer with the Wadsworth mounting of a 60° prism and plane mirror are calculated for 25°C. Tables are given with which corrections may be easily made for temperatures other than 25°C and for prism angles between 59 and 61°.