Determination of atmospheric carbon dioxide concentration using Raman spectroscopy.

The paper demonstrates the possibility of measuring the carbon dioxide (CO 2 ) concentration in atmospheric air using Raman spectroscopy. Three methods have been studied for deriving the CO 2 concentration from the Raman spectra (the peak intensity ratio, the integrated intensity ratio, the contour fit method). The best results were obtained when the contour fit method is applied for Raman spectra processing. In this case the deviations from reference mixtures of known concentration were below 3 ppm. Methods for improving the sensitivity of the Raman gas analysis method are proposed and the possibility for using this technique for the simultaneous determination of the concentrations of significant amount of greenhouse gases in air with single device is discussed. [ABSTRACT FROM AUTHOR]