Abstract
Maleic anhydride (C2H2(CO)2O, Furan-2,5-dione) is emitted into or formed in the atmosphere during bio-mass burning events as well as being a photochemical degradation product of some aromatic volatile organic compounds. The photochemical fate of maleic anhydride, however, is presently not well enough characterized to enable modeling of its impact on the environment and human health. Maleic anhydride is a strong UV absorbing molecule with a continuous spectrum that extends well into the long-wavelength atmospheric actinic region, >295 nm. In this study, the room temperature UV and infrared absorption spectra of maleic anhydride were measured and quantified using several complementary calibration methods. In addition, photolysis quantum yields and stable end-product yields were measured following its 248 nm pulsed laser photolysis. Photoproducts were measured at room temperature using Fourier transform infrared spectroscopy detection under slow flow conditions at total pressures in the range 100–600 Torr (Syn. Air). The maleic anhydride photolysis quantum yield was determined to be 0.85 ± 0.20, independent of pressure, with CO, CO2, and acetylene (C2H2) photo-products formed with a 1:1:1 stoichiometric ratio and a yield of 1 ± 0.15, independent of total pressure.
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