Abstract

By means of a cavity-enhanced absorption spectroscopy technique, we have monitored the temporal evolution of O3, NO2, and NO3 (NOx) formation after the filamentation of femtosecond laser pulses in air, providing a precise real-time measurement of the accumulative contribution of filaments. We have found that the growth of NO3 concentration in the atmosphere after the onset of a filamentation regime is 3 orders of magnitude lower than that of NO2 and O3. The multi-wavelength feature of the technique allows the simultaneous sampling of NOx and O3 directly in the filament region.

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