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) / Aldehydes(aliphatic) / CH2O / Friedrichs(2002)_295-2000K_174nm

DATAFILE: CH2O_Friedrichs(2002)_295-2000K_174nm.txt
NAME: formaldehyde, methanal
FORMULA: CH2O
AUTHOR(YEAR): Friedrichs(2002)
T: 295-2000K
λ: 174nm
BIBLIOGRAPHY: G. Friedrichs, D.F. Davidson, and R.K. Hanson, "Direct measurements of the reaction H + CH2O → H2 + HCO behind shock waves by means of Vis–UV detection of formaldehyde", Int. J. Chem. Kinet. 34, 374-386 (2002); DOI: 10.1002/kin.10059
COMMENTS: Shock heating of mixtures of formaldehyde in argon provided absorption cross sections at room temperature (absorption level of initial gas mixture), temperatures around 900 K (incident shock wave plateau levels), and 1750 K (reflected shock wave absorption level at t ∼ 0 μs); also experiments with formaldehyde/ethyl iodide/argon mixtures were used to determine the formaldehyde cross sections

A microwave N2 discharge lamp was used to generate light of 174 nm

Temperature dependence for the effective extinction coefficients α(T) in cm2/mole (base e) for T = 295- 1050 K and 1400-2000 K:

log10 α(T) = 7.08 + 4.26 × 10-5 T - 6.18 × 10-8 T2

Conversion of α(T) to σ(T) using factor 1.66×10-24

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