The MPI-Mainz UV/VIS Spectral Atlas

of Gaseous Molecules of Atmospheric Interest

www.uv-vis-spectral-atlas-mainz.org

Hannelore Keller-Rudek1, Geert K. Moortgat2, Rolf Sander2, Rüdiger Sörensen1

1Satellite Group

2Atmospheric Chemistry Division

Max-Planck Institute for Chemistry
Mainz, Germany

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When referring to the Spectral Atlas, please cite our publication:

Keller-Rudek, H., Moortgat, G. K., Sander, R., and Sörensen, R.: The MPI-Mainz UV/VIS spectral atlas of gaseous molecules of atmospheric interest, Earth Syst. Sci. Data, 5, 365–373, (2013), DOI: 10.5194/essd-5-365-2013

Cross Sections / Organics (carbonyls) / Carbonyl oxides / CH2OO / Beames(2012)_298K_281-410nm

DATAFILE: CH2OO_Beames(2012)_298K_281-410nm.txt
NAME: formaldehyde oxide
FORMULA: CH2OO
AUTHOR(YEAR): Beames(2012)
T: 298K
λ: 281-410nm
BIBLIOGRAPHY: J.M. Beames, J.M., F. Liu, L. Lu, and M.I. Lester, "Ultraviolet spectrum and photochemistry of the simplest Criegee intermediate CH2OO", J. Am. Chem. Soc. 134, 20045-20048 (2012); DOI: 10.1021/ja310603j
COMMENTS: Synthesis of the simplest Criegee biradical intermediate by photolysis (248 nm) of a CH2I2-O2-Ar gas mixture and subsequent supersonic expansion; absorption measurements of the isolated CH2OO species by electronic excitation of the B 1A′ ← X 1A′ transition using tunable UV laser radiation (280-420 nm).

Absorption cross sections have been obtained by personal communication from M. I. Lester and J. M. Beames (July 2013) together with the following remark:

The maximum absorption cross section was estimated at 5 × 10-17 cm2 molecule-1; experimental factors (e.g. homogeneity of the laser beam and laser-molecular beam overlap) suggest that absolute cross section measurements have uncertainties on the order of a factor of 2.

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