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 / Oxygen / O4 / Shardanand(1969)_298K_244-280nm

DATAFILE: O4_Shardanand(1969)_298K_244-280nm.txt
NAME: oxygen dimer
FORMULA: O4
AUTHOR(YEAR): Shardanand(1969)
T: 298K
λ: 244-280nm
BIBLIOGRAPHY: Shardanand, "Absorption cross sections of O2 and O4 between 2000 and 2800 Å", Phys. Rev. 186, 5-9 (1969); DOI: 10.1103/PhysRev.186.5
COMMENTS: Medium-resolution (0.25 nm) absorption measurements using a 0.3-m Mc Pherson vacuum-ultraviolet-scanning grating monochromator, a hydrogen-discharge light source, and a photomultiplier tube as the detector

The listed data (digitized from Fig. 4) are the cross sections σ2 derived from the measured (pressure dependent) absorption cross sections σeff and using the relation

σeff(λ) = σ1(λ) + K σ2(λ) n(O2)

with K = equilibrium constant for O2 + O2 ↔ O4, n(O2) = number density of the gas

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