Open AccessA novel, broadband spectroscopic method to measure the extinction coefficient of aerosols in the near-ultraviolet
Author(s) -
Eoin Wilson,
Jun Chen,
M. K. Ravi Varma,
John Wenger,
Dean S. Venables
Publication year - 2013
Publication title -
aip conference proceedings
Language(s) - English
Resource type - Conference proceedings
eISSN - 1551-7616
pISSN - 0094-243X
DOI - 10.1063/1.4804730
Subject(s) - aerosol , extinction (optical mineralogy) , radiative transfer , ultraviolet , attenuation coefficient , absorption (acoustics) , materials science , molar absorptivity , atmosphere (unit) , spectroscopy , particle (ecology) , analytical chemistry (journal) , optics , chemistry , optoelectronics , physics , environmental chemistry , meteorology , quantum mechanics , composite material , oceanography , geology
Few in situ methods can currently measure the optical properties of aerosols in the near-ultraviolet spectral region. Such measurements are necessary to determine the radiative forcing of different particle types and the subsequent effect on local photochemistry, especially in and around large urban centers. In this work, we demonstrate a system based on incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) to measure the aerosol extinction coefficient with high sensitivity. The system was applied across an atmosphere simulation chamber and had continuous spectral coverage from 320 to 410 nm. Systems studied were ammonium sulfate aerosol and secondary organic aerosol (SOA) formed from the photolysis of 1-nitronaphthalene, an important nitro-polycyclic aromatic hydrocarbon.
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