The experimental results have verified the linear behavior of the intensity of Raman scattered light as a function of specie concentration. It can be concluded that the technique is capable of identifying and measuring concentrations of individual gaseous species in a mixture during a single 10-nanosec sampling time. By repeating the sampling at the laser rate of 100 pulses per sec, it is possible to monitor a dynamic gas flow situation. For the case of 65 cm of nitrogen at 3000 psi injected into a spherical mixing chamber containing 100 psi of helium, results obtained using the Raman scattering technique illustrate the rapid mixing which is occurring in the vessel. The proven merit of this facility has encouraged the extension of the technique to the study of general gas mixing problems, evaluation of transport properties, and the study of highpressure, real gas effects.