Estimation of the limiting sensitivity of the laser fragmentation/laser-induced fluorescence method for the detection of vapors of nitrocompounds in the atmosphere
S.M. Bobrovnikov1, E.V. Gorlov1, V.I. Zharkov2
1National Research Tomsk State University, Tomsk, Russia
2V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: laser fragmentation, nitrocompound, nitrobenzene, nitrotoluene, laser-induced fluorescence, nitric oxide, NO-fragment
Abstract
The limiting sensitivity of a method for detecting vapors of nitrocompounds in the atmosphere based on laser fragmentation/laser-induced fluorescence is estimated in calculations with the developed kinetic model of the LF/LIF process. The calculations take into account the influence of atmospheric nitrogen dioxide as a limiter of the sensitivity of the method when operating in a real atmosphere. It is shown that if the concentration of nitrogen dioxide in the atmosphere does not exceed 10 ppb, the maximum detectable concentrations of nitrobenzene and o -nitrotoluene vapors are ppb-level. It was also shown that the one-color excitation method usually used for the detection of nitrocompounds does not allow attaining the maximum efficiency of the LF/LIF process.
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