AEROSOL FORMATION BY THE PHOTOOXIDATION OF CYCLOHEXENE IN THE PRESENCE OF NITROGEN-OXIDES

Photochemical aerosol formation from cyclohexene (C//6H//1//0) was studied in a ppm concentration range in the presence of nitrogen oxides. It was found that the aerosol was formed by the reaction of C//6H//1//0 with ozone(O//3), while the products of the C//6H//1//0 plus OH reaction had substantially no contribution to the aerosol production. The average carbon-based aerosol yield from the O//3 reaction was shown to be 18. 3 plus or minus 3. 6 percent for a C//6H//1//0 initial concentration range of 5-10 ppm. However, the yield was found to decrease nonlinearly as the initial concentration was decreased, and consequently, it was pointed out that, in obtaining the yield in the actual environmental condition, an extrapolation of the result from higher concentration experiments to a lower concentration region should be done with caution. Additional study results are discussed.