Photochemical formation rates and optical properties of organic aerosols through time-resolved in situ laboratory measurements

Details Photochemical formation rates and optical properties of organic aerosols through time-resolved in situ laboratory measurements Photochemical formation rates and optical properties of organic aerosols through time-resolved in situ laboratory measurements

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....7857a&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #7857

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Scientific paper

Hydrocarbon hazes generated photochemically by UV irradiation of methane and other precursor gases are ubiquitous on the outer planets and satellites of the solar system. 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 at vacuum ultraviolet wavelengths (120-160nm) via in situ optical scattering at several different wavelengths and online quadrupole mass spectrometry (1-200 amu). Results for the generation of particulate hydrocarbons from irradiation of pure CH4 and mixtures of gases relevant to outer solar system atmospheres, along with simultaneous measurements of the evolution of higher gas-phase hydrocarbons, will be presented.

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