Physics
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3603816l&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 3, CiteID L03816
Physics
Global Change: Abrupt/Rapid Climate Change (4901, 8408), Atmospheric Composition And Structure: Troposphere: Constituent Transport And Chemistry, Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Processes: Theoretical Modeling
Scientific paper
Although accurate knowledge of OH diffusion under atmospheric conditions is important, only one experimental study has been carried out at room temperature. Here, we report laboratory measurements of the OH diffusion coefficient in He and in a mixture of He and air over the range 218-318 K, using a temperature-controlled flow tube coupled to a low-pressure chemical ionization mass spectrometer. The results, which show a strong, almost square dependence of the diffusion coefficient on temperature in He and air, are consistent with predictions obtained from our theoretical calculations for diffusion of its polar diffusive analogue, H2O, using the 6-12 Lennard-Jones potential model with the collision parameters of water. This supports our hypothesis that the diffusion of OH can be accurately represented in the atmosphere by water, its polar diffusive analogue.
Ivanov Andrey V.
Liu Ya-Ying
Molina Mario J.
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