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- W1520773809 abstract "Photochemical Aitken nucleus formation in filtered atmospheric air has been examined using both solar irradiation and ultraviolet radiation from artificial sources. In contrast to previous work, extreme care has been taken to insure that nucleus formation is due to trace gases in the air and not to system contaminants and the photo chemical experiments have been analyzed in light of measurements of the ambient aerosol size distribution and the associated coagulative mass transport. Photochemically induced nucleus formation has been observed only when 1850 A UV radiation (from low pressure Hg sources) is present. Once sufficient precautions have been taken to clean the photoreactor walls, solar radiation does not produce nuclei in filtered atmospheric air even after irradiation for 2-3 hours. The diffusive survival time of a newly formed nucleogen molecule, estimated using measured aerosol size distributions, is only some 5-10 minutes. Based on these time scales it is concluded that the most likely fate of photochemical nucleogen is attachment to the existing aerosol rather than new particle formation. The small amount of aerosol in the r s .005 y region of the measured size distributions and the inability of solar induced nucleus formation to account for the aerosol removed by coagulative mass transport both indicate that the photochemical mechanisms which have" @default.
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- W1520773809 date "1978-05-01" @default.
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- W1520773809 title "A STUDY OF PHOTOCHEMICAL AEROSOL FORMATION AND THE COAGULATIVE MASS TRANSPORT IN NATURAL AND LABORATORY AEROSOL - GAS MIXTURES" @default.
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