Vol. 15, issue 05-06, article # 19

Dubtsov S. N., Chesnokov E. N., Krasnoperov L. N. Kinetics of the aerosol formation at 193-nm photolysis of 1.4-cyclohexadiene-NO-air mixture. // Atmospheric and oceanic optics. 2002. V. 15. No. 05-06. P. 445-447. PDF
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A new experimental technique has been developed for direct time-resolved studies of the kinetics of aerosol formation. It is based on a combination of pulsed excimer laser photolysis and space- and time-resolved monitoring of scattered light with a gated intensified CCD camera. The experimental setup allowed detection of aerosol particles more than 45-50 nm in diameter and with the number concentration ranging from 3 106 to 6 108 particles/cm3. The time range of aerosol formation kinetics was from 10-7 to 10-2 s. Kinetics of photochemically induced aerosol formation in 1.4-cyclohexadiene-NO-air mixture was studied. The evolution of the particle number concentration and the size distribution was investigated, as well as the increase in the scattered light intensity depending on a delay after the photolyzing pulse. Quantum yield of aerosol products was estimated to be in the range from 10-2 to 2%, which is comparable with the values characteristic of organic aerosols.