Absorption of infrared radiation by CO2 and H2O. Experimental techniques

The experimental techniques used in an extensive laboratory investigation of the infrared absorption and emission by CO2 and H2O are described. Apparatus discussed include two multiple-pass absorption cells with base lengths of approximately 1 and 29 m, gas-handling systems, a prism spectrometer and a grating spectrometer with their accessories, and a system used to digitize absorption spectra. Also discussed are methods used in gas sampling, checking for possible sources of error, and recording and analyzing the data.