Surface enrichment of soot particles in photoelectrically active trace species

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Abstract

Combustion aerosols are examined by in situ photoelectron emission. The photoelectric yield Y is determined as a function of the particle size. For car exhaust, Y is proportional 1/R. This is consistent with the assumption that hydrocarbons exhibiting low photothresholds have been deposited on the surface of larger soot particles. Y then corresponds to the degree of surface enrichment in compounds of low photothreshold. For aerosols produced by incomplete combustion of butane, Y does not depend on the particle size, indicating a complete coverage of the surface. The surface material may confer high chemical activity to the particles although being present only as traces. © 1984.

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Burtscher, H., & Schmidt-ott, A. (1984). Surface enrichment of soot particles in photoelectrically active trace species. Science of the Total Environment, The, 36(C), 233–238. https://doi.org/10.1016/0048-9697(84)90271-7

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