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 / Davidson(1995)_1300-2500K_216.615nm(fit)

DATAFILE: CH3_Davidson(1995)_1300-2500K_216.615nm(fit).txt
NAME: methyl radical
FORMULA: CH3
AUTHOR(YEAR): Davidson(1995)
T: 1300-2500K
λ: 216.615nm(fit)
BIBLIOGRAPHY: D.F. Davidson, M.D. Di Rosa, E.J. Chang, and R.K. Hanson, "An improved determination of the 216.615 nm absorption coefficient for methyl radicals", J. Quant. Spectrosc. Radiat. Transfer 53, 581-583, (1995); DOI: 10.1016/0022-4073(95)90056-X
COMMENTS: Absorption measurements in shock-heated dimethyl mercury, methyl iodide, ethane, and azomethane as methyl precursors

Absorption constants k (atm-1 cm-1) (base e) have been calculated by the least-squares expression

k(λ) = 1.47 × 105T-1 exp(-T/1675), valid in the temperature range T = 1311-2506 K,

and converted to absorption cross sections sections (conversion factor RT = 1.36×10-22 T; R (gas constant) in cm3 atm molecule-1 K-1)

These measurements of the methyl absorption coefficient replace the earlier measurements of

D.F. Davidson, A.Y. Chang, M.D. Di Rosa, and R.K. Hanson, J. Quant. Spectrosc. Radiat. Transfer 49, 559-571 (1993); DOI: 10.1016/0022-4073(93)90067-R

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