Abstract
A technique has been developed for making precise measurements of refractive index dispersion in gases. The instrument, termed ``dispersometer,'' uses a cavity resonating in two modes simultaneously to measure the difference in index at two frequencies. Since the gas sample is common to both modes, effects of variations in gas pressure, temperature, and composition between samples are removed. In an early model, the precision of the measured dispersion was a few parts in 108 (of refractive index). The method has been used to date for a study of the 0.74 cm−1 water vapor line (reported separately) and should be equally applicable to other spectral regions, limited only by the available generation and detection devices.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
