The MPI-Mainz UV/VIS Spectral Atlas

of Gaseous Molecules of Atmospheric Interest

https://www.uv-vis-spectral-atlas-mainz.org, https://uvvis.mpch-mainz.gwdg.de

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 / Alkanes+alkyl radicals / Alkyl radicals / CH3 / Macpherson(1985)_298-537K_216.36nm

DATAFILE: CH3_Macpherson(1985)_298-537K_216.36nm.txt
NAME: methyl radical
FORMULA: CH3
AUTHOR(YEAR): Macpherson(1985)
T: 298-537K
λ: 216.36nm
BIBLIOGRAPHY: M.T. Macpherson, M.J. Pilling, and M.J.C. Smith, "Determination of the absorption cross section for CH3 at 216.36 nm and the absolute rate constant for methyl radical recombination over the temperature range 296-577 K", J. Phys. Chem. 89, 2268-2274 (1985); DOI: 10.1021/j100257a024
COMMENTS: Absorption measurements over the temperature range 298 and 350-537 K by a repetitive photolysis method in which a known initial pressure of azomethane was repeatedly photolyzed with an ArF laser (193 nm) and the zero-time absorbance determined following each laser pulse; spectral resolution 0.60 nm

The cross section at 301 K was determined by comparing the ethane yield (CH3 + CH3 → C2H6), as measured by gas chromatography, with the zero-time CH3 absorbance following laser flash photolysis of azomethane at 193 nm; spectral resolution 0.6 nm

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