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- Title
The atmospheric chemistry of glycolaldehyde
- Authors
Tyndall, Geoffrey S.; Orlando, John J.; Bacher, Camilla
- Abstract
The chemistry of glycolaldehyde (hydroxyacetaldehyde) relevant to the troposphere has been investigated using UV absorption spectrometry and FTIR absorption spectrometry in an environmental chamber. Quantitative UV absorption spectra have been obtained for the first time. The UV spectrum peaks at 277 nm with a maximum cross section of (5.51 0.7)x 10^-20 cm^2 molecule^-1. Studies of the ultraviolet photolysis of glycolaldehyde (l = 285 1 25 nm) indicated that the overall quantum yield is >0.5 in one bar of air, with the major products being CH2OH and HCO radicals. Rate coefficients for the reactions ofCl atoms and OH radicals with glycolaldehyde have been determined tobe (7.6 1 1.5)x 10^-11 and (1.11 0.3)x 10^-11 cm3 molecule^-1 s^-1, respectively, in good agreement with the only previous study. The lifetime of glycolaldehyde in the atmosphere is about 1.0 dayfor reaction with OH, and >2.5 days for photolysis, although both wet and dry deposition should also be considered in future modeling studies.
- Subjects
ATMOSPHERIC chemistry; HYDROXYL group
- Publication
Journal of Atmospheric Chemistry, 2001, Vol 39, Issue 2, p171
- ISSN
0167-7764
- Publication type
Article