In situ measurements of the photochemical formation rates and optical properties of organic aerosols in CH4/CO2 mixtures.

Details In situ measurements of the photochemical formation rates and optical properties of organic aerosols in CH4/CO2 mixtures. In situ measurements of the photochemical formation rates and optical properties of organic aerosols in CH4/CO2 mixtures.

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dps....35.1609a&link_type=abstract

American Astronomical Society, DPS meeting #35, #16.09; Bulletin of the American Astronomical Society, Vol. 35, p.1484

Astronomy and Astrophysics

Astronomy

Scientific paper

The presence of photochemically-generated hazes has a significant impact on radiative transfer in planetary atmospheres. While the rates of particle formation have been inferred from photochemical or microphysical models constrained to match observations, these rates have not been determined experimentally. Thus, the fundamental kinetics of particle formation are not known and remain highly parameterized in planetary atmospheric models. We have developed instrumentation for measuring the formation rates and optical properties of organic aerosols produced by irradiating mixtures of precursor gases via in situ optical (633nm) scattering and online quadrupole mass spectrometry (1-200 amu). Results for the generation of particulate hydrocarbons from the irradiation of pure, gas-phase CH4 as well as CH4/CO2 mixtures with vacuum ultraviolet (120-160nm) light, along with simultaneous measurements of the evolution of higher gas-phase hydrocarbons will be presented.

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