Absorption of infra-red radiation by atmospheric molecular cluster-ions

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dc.creatorAplin, K. L.
dc.creatorMcPheat, R. A.
dc.date2005-02-09
dc.date.accessioned2026-07-07T05:54:08Z
dc.date.available2026-07-07T05:54:08Z
dc.descriptionProtonated water clusters are a common species of atmospheric molecular cluster-ion, produced by cosmic rays throughout the troposphere and stratosphere. Under clear-sky conditions or periods of increased atmospheric ionisation, such as solar proton events, the IR absorption by atmospheric ions may affect climate through the radiative balance. Fourier Transform Infrared Spectrometry in a long path cell, of path length 545m, has been used to detect IR absorption by corona-generated positive molecular cluster-ions. The column concentration of ions in the laboratory spectroscopy experiment was estimated to be ~10^13 m-2; the column concentration of protonated atmospheric ions estimated using a simple model is ~10^14 m-2. Two regions of absorption, at 12.3 and 9.1 um are associated with enhanced ion concentrations. After filtering of the measured spectra to compensate for spurious signals from neutral water vapour and residual carbon dioxide, the strongest absorption region is at 9.5 to 8.8 um (1050 to 1140 cm-1) with a fractional change in transmissivity of 0.03 plus/minus 0.015, and the absorption at 12.5 to 12.1 um (800 to 825 cm-1) is 0.015 plus/minus 0.008.
dc.descriptionIn press at Journal of Atmospheric and Solar-Terrestrial Physics
dc.identifierhttps://arxiv.org/abs/physics/0502041
dc.identifierhttp://arxiv.org/abs/physics/0502041
dc.identifierJ. Atmos Sol-Terr Phys, 67, 8-9 pp 775-783, 2005
dc.identifierdoi:10.1016/j.jastp.2005.01.007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/86864
dc.subjectAtmospheric and Oceanic Physics
dc.subjectAtomic and Molecular Clusters
dc.subjectGeophysics
dc.titleAbsorption of infra-red radiation by atmospheric molecular cluster-ions
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