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 / Alkanes+alkyl radicals / Alkanes / CH4 / Thompson(1963)_298K_185-400nm(upper limit)

DATAFILE: CH4_Thompson(1963)_298K_185-400nm(upper limit).txt
NAME: methane
FORMULA: CH4
AUTHOR(YEAR): Thompson(1963)
T: 298K
λ: 185-400nm(upper limit)
BIBLIOGRAPHY: B.A. Thompson, P. Harteck, and R.R. Reeves, Jr., "Ultraviolet absorption coefficients of CO2, CO, H2O, N2O, NH3, NO, SO2, and CH4 between 1850 and 4000 Å", J. Geophys. Res. 68, 6431-6436 (1963); DOI: 10.1029/JZ068i024p06431
COMMENTS: Absorption measurements with a Perkin-Elmer spectrophotometer able to measure absorption coefficients k as low as 10-4 cm-1 (~4×10-24 cm2 molecule-1)

For CH4 no absorption could be detected; thus the absorption coefficients is less than 10-4 cm-1, and the absorption cross sections are only upper limits for the entire range investigated

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