A review of infrared fluorescence is presented. Emphasis is placed on the experimental evaluation of laser-induced infrared fluorescence as a method for the remote sensing of molecular air pollutants. Methods of fluorescence excitation, fluorescence lifetimes, and possible interferences are discussed. The performance of a hypothetical remote sensing apparatus is evaluated. Experimental results and theoretical calculations indicate that the construction of an infrared fluorescence remote sensing device is feasible.
(1973). Relation Between Laser Induced Infrared Fluorescence and Laser Absorption By Pollutant Gases. Spectroscopy Letters: Vol. 6, No. 9, pp. 569-583.
In order to use laser-induced IR fluorescence as a tool in quantitative analysis. Various parameters governing the relationship between fluorescence intensity and sample concentration must be understood. To that end the effect on fluorescence intensity of laser power, sample concentration, quantum efficiency, collision deactivation and pressure broadening have been studied.
Laser induced infrared fluorescence1,2 is potentially a method for the remote detection of atmospheric pollutants.3,4 An important parameter in the evaluation of this technique is the relationship between fluorescence intensity and the variation of the angle between the stimulating laser beam and the viewing direction of the detection system. It is important for monitoring procedures that the fluorescence be isotropic, otherwise the quantitative interpretation of the data becomes very complicated.
Laser induced infrared fluorescence1,2 is a potential method for the remote detection of atmospheric pollutants.3,4 In evaluating this technique as a quantitative analytical tool, two important parameters are (a) the lifetimes of the excited species and (b) the quenching efficiencies of various molecules which would be expected to be in the atmosphere and which may collide with the excited species. Such quenching would lead to low fluorescence intensity and low analytical data. We have measured the quenching of the fluorescence of ethylene, which is a common hydrocarbon pollutant, by nitrogen, nitrogen saturated with water vapor, and air.
