INFLUENCE OF THE SPECTRAL LINEWIDTHS OF A C[O.sub.2] LASER ON THE ERROR IN MEASURING GAS CONCENTRATIONS ON THE EXAMPLE OF AMMONIA

The influence of the parameters (laser linewidths and profiles) of the C[O.sub.2] laser based on the main molecular isotope on the absorption coefficient of a gaseous compound is analyzed using ammonia as an example. Results of application of the C[O.sub.2] laser for the determination of the gaseous ammonia content are considered and possible errors in calculating the gas concentration caused by the neglect of the specific spectral linewidth of the C[O.sub.2] laser are analyzed. Keywords: C[O.sub.2] laser, linewidth, ammonia, atmosphere, gas analysis, radiation, absorption, transmission.