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 / Silicon compounds / [-Si(CH3)2O-]4 / Bernard(2018)_296K_184.95nm

DATAFILE: [-Si(CH3)2O-]4_Bernard(2018)_296K_184.95nm.txt
NAME: octamethylcyclotetrasiloxane, D4
FORMULA: [-Si(CH3)2O-]4
AUTHOR(YEAR): Bernard(2018)
T: 296K
λ: 184.95nm
BIBLIOGRAPHY: F. Bernard, D.K. Papanastasiou, V.C. Papadimitriou, and J.B. Burkholder, "Temperature dependent rate coefficients for the gas-phase reaction of the OH radical with linear (L2, L3) and cyclic (D3, D4) permethylsiloxanes", J. Phys. Chem. 122, 4252-4264 (2018); DOI: 10.1021/acs.jpca.8b01908
COMMENTS: The UV absorption measurement was performed using a Hg pen-ray lamp 184.95 nm light source, a 25 cm absorption cell, and a photodiode with a 185 nm band-pass filter

Absorption cross section measurements, using a monochromator with a D2 light source, at 195 and 225 nm demonstrated that the UV absorption spectrum of the permethylsiloxanes decreases significantly toward longer wavelengths with a cross section of less than 1×10-21 cm2 molecule-1 at 225 nm

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