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- Title
Absolute ozone absorption cross section in the Huggins Chappuis minimum (350-470nm) at 296K.
- Authors
Axson, J. L.; Washenfelder, R. A.; Kahan, T. F.; Young, C. J.; Vaida, V.; Brown, S. S.
- Abstract
We report the ozone absolute absorption cross section between 350-470 nm, the minimum between the Huggins and Chappuis bands, where the ozone cross section is less than 10-22 cm². Ozone spectra were acquired using an incoherent broadband cavity enhanced absorption spectrometer, with three channels centered at 365, 405, and 455 nm. The accuracy of the measured cross section is 2 %. Previous measurements vary by more than an order of magnitude in this spectral region. The measurements reported here provide much greater spectral coverage than the most recent measurements. We report a minimum absorption cross section of 3.4x10-24 cm² at 381.8 nm, which is 22% lower than the previously reported value. The effect of O3 concentration and water vapor partial pressure were investigated, however there were no observable changes in the absorption spectrum most likely due to the low optical density of the complex.
- Subjects
OZONE; ABSORPTION; SPECTRUM analysis; OPACITY (Optics); ATMOSPHERIC chemistry; ATMOSPHERIC physics; ELECTROMAGNETIC waves
- Publication
Atmospheric Chemistry & Physics Discussions, 2011, Vol 11, Issue 8, p21655
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-11-21655-2011