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

Home

Cross Sections

Quantum Yields

Errata

Contact, Imprint, Acknowledgements

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 / Hwang(1993)_1300-1700K_213.9nm

DATAFILE: CH3_Hwang(1993)_1300-1700K_213.9nm.txt
NAME: methyl radical
FORMULA: CH3
AUTHOR(YEAR): Hwang(1993)
T: 1300-1700K
λ: 213.9nm
BIBLIOGRAPHY: S.M. Hwang, M.J. Rabinowitz, and W.C. W.C. Gardiner, Jr., "Recombination of methyl radicals at high temperatures", Chem. Phys. Lett. 205, 157-162 (1993); DOI: 10.1016/0009-2614(93)89221-3
COMMENTS: Absorption measurements at the zinc atomic line in shock-heated azomethane-argon mixtures

The temperature dependence of the absorption coefficient k (atm-1 cm-1) (base e) plotted in Fig. 1 of

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 I", J. Quant. Spectrosc. Radiat. Transfer 53, 581-583 (1995): DOI: 10.1016/0022-4073(95)90056-X,

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

This results in a temperature-independent absorption cross section of (7.94 ± 0.03)×10-18 cm2 molecule -1

Hwang et al. however give a temperature-independent decadic absorptivity of ε = ( 1.04 ± 0.13) × 106 cm6/mol, which is converted to σ = (3.98 ± 0.50) × 10-18 cm2 molecule-1

Search cross sections

Species search:
Identifier search:
Reference search:
Full text search:
Recent additions:
since ago