A broadband optical cavity spectrometer for measuring weak near-ultraviolet absorption spectra of gases

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dc.contributor.authorChen, Jun
dc.contributor.authorVenables, Dean S.
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderEuropean Commissionen
dc.date.accessioned2012-11-08T11:38:27Z
dc.date.available2012-11-08T11:38:27Z
dc.date.copyright2011
dc.date.issued2011-01
dc.date.updated2012-10-23T15:09:53Z
dc.description.abstractAccurate absorption spectra of gases in the near-ultraviolet (300 to 400 nm) are essential in atmospheric observations and laboratory studies. This paper describes a novel incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) instrument for measuring very weak absorption spectra from 335 to 375 nm. The instrument performance was validated against the B-3(1)-X(1)A(1) transition of SO2. The measured absorption varied linearly with SO2 column density and the resulting spectrum agrees well with published spectra. Using the instrument, we report new absorption cross-sections of O-3, acetone, 2-butanone, and 2-pentanone in this spectral region, where literature data diverge considerably. In the absorption minimum between the Huggins and Chappuis bands, our absorption spectra fall at the lower range of reported ozone absorption cross-sections. The spectra of the ketones agree with prior spectra at moderate absorptions, but differ significantly at the limits of other instruments' sensitivity. The collision-induced absorption of the O-4 dimer at 360.5 nm was also measured and found to have a maximum cross-section of ca. 4.0 x 10(-46) cm(5) molecule(-2). We demonstrate the application of the instrument to quantifying low concentrations of the short-lived radical, BrO, in the presence of stronger absorptions from Br-2 and O-3.en
dc.description.sponsorshipScience Foundation Ireland (06/RFP/CHP055); European Commission (EU FP7 project EUROCHAMP2,Grant no. 228335)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationChen, J, Venables, DS; (2011) 'A broadband optical cavity spectrometer for measuring weak near-ultraviolet absorption spectra of gases'. Atmospheric Measurement Techniques, 4 :425-436. http://dx.doi.org/10.5194/amt-4-425-2011en
dc.identifier.doi10.5194/amt-4-425-2011
dc.identifier.endpage436en
dc.identifier.issn1867-1381
dc.identifier.issn1867-8548
dc.identifier.issued3en
dc.identifier.journaltitleAtmospheric Measurement Techniquesen
dc.identifier.startpage425en
dc.identifier.urihttps://hdl.handle.net/10468/742
dc.identifier.volume4en
dc.language.isoenen
dc.publisherCopernicus Publications on behalf of the European Geosciences Union.en
dc.rights© Author(s) 2011. This work is distributed under the Creative Commons Attribution 3.0 License.en
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en
dc.subjectScattering cross-sectionsen
dc.subjectNM regionen
dc.subjectTemperature dependenceen
dc.subjectAerosol extinctionen
dc.subjectSpectoscopyen
dc.subjectKineticsen
dc.subjectAcetoneen
dc.subjectKetonesen
dc.titleA broadband optical cavity spectrometer for measuring weak near-ultraviolet absorption spectra of gasesen
dc.typeArticle (peer-reviewed)en
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