Knowledge Bank

“Several modulation methods for observing infrared absorption spectra were discussed by Magnuson and Smith at this Symposium in 1955. One of these methods, in which pressure modulation is employed, has been used in this $laboratory.1$ The present paper will describe recent results and will discuss the possibility of using the method for determining curves of growth of single spectral lines in terms of absorber concentration w, partial pressure p of the absorbing gas, and the total pressure P of the gas sample.”