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Article: Absorption cross section measurements of oxygen in the wavelength region 195-241 nm of the Herzberg continuum

TitleAbsorption cross section measurements of oxygen in the wavelength region 195-241 nm of the Herzberg continuum
Authors
Issue Date1986
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/pss
Citation
Planetary And Space Science, 1986, v. 34 n. 11, p. 1007-1021 How to Cite?
AbstractThe continuum cross section of oxygen at 296-300 K has been measured with a resolution of 0.13 nm throughout the wavelength region 205-241 nm with oxygen pressures from 5 to 760 torr and optical path lengths from 13.3 and 133m. The three processes contributing to the observed cross section are absorption into two kinds of continua, viz. the Herzberg continua of O 2 and a pressure-dependent continuum involving two molecules of O 2, and Rayleigh scattering. Extrapolation of the observed cross section to zero pressure yields the continuum cross section of O 2, from which the calculated Rayleigh scattering is subtracted to give the Herzberg continuum absorption cross section of O 2. Our previous continuum cross sections [Cheung et al. (1984) Can. J. Phys. 62, 1752], obtained from studies at high resolution (0.0013 nm) between the Schumann-Runge absorption lines in the region 194-204 nm, are here adjusted for Schumann-Runge line-wing contributions. These adjusted cross sections are compared with those calculated from computed Franck-Condon densities and a transition moment extrapolated from that calculated from our more accurate cross section measurements at longer wavelengths. Our calculated cross section in the region 195-237 nm is similar in shape to that calculated by Saxon and Slanger [J. geophys. Res., 91, 9877] from the transition moments computed ab initio by Klotz and Peyerimhoff [Molec. Phys., 57, 573]. Our values of the Herzberg continuum cross section of oxygen, tabulated at 1 nm intervals in the region 195-241 nm, increase from 6.3 × 10 -24 cm 2 at 195 nm to a maximum of 6.6 × 10 -24 cm 2 at 201 nm and then decrease to 0.85 × 10 24 cm 2 at 241 nm. Our results agree with those in the region 205-225 nm covered by the most recent previous laboratory study [Johnston et al. (1984) J. geophys. Res. 89, 11661] and are consistent with values in the region 200-220 nm spanned collectively by three in situ stratospheric studies [Frederick and Mentall (1982) Geophys. Res. Lett. 9, 461; Herman and Mentall (1982) J. geophys. Res. 87, 8967; Anderson and Hall (1983) J. geophys. Res. 88, 6801]. The larger Herzberg continuum cross sections found in another in situ stratospheric study [Pirre et al. (1984) Geophys. Res. Lett. 11, 1199] are in definite disagreement with our laboratory values, certainly in the region 205-214 nm. Our Herzberg continuum cross sections in the region 195-241 nm are significantly lower than those previously used in many photochemical stratospheric modelling calculations. Acceptance of our cross sections in such models will affect markedly the calculated altitude profiles of ozone, nitrous oxide, chlorofluorocarbons, and other trace stratospheric species. © 1986.
Persistent Identifierhttp://hdl.handle.net/10722/147721
ISSN
2015 Impact Factor: 1.942
2015 SCImago Journal Rankings: 1.072
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DC FieldValueLanguage
dc.contributor.authorCheung, ASCen_HK
dc.contributor.authorYoshino, Ken_HK
dc.contributor.authorParkinson, WHen_HK
dc.contributor.authorGuberman, SLen_HK
dc.contributor.authorFreeman, DEen_HK
dc.date.accessioned2012-05-29T06:08:54Z-
dc.date.available2012-05-29T06:08:54Z-
dc.date.issued1986en_HK
dc.identifier.citationPlanetary And Space Science, 1986, v. 34 n. 11, p. 1007-1021en_HK
dc.identifier.issn0032-0633en_HK
dc.identifier.urihttp://hdl.handle.net/10722/147721-
dc.description.abstractThe continuum cross section of oxygen at 296-300 K has been measured with a resolution of 0.13 nm throughout the wavelength region 205-241 nm with oxygen pressures from 5 to 760 torr and optical path lengths from 13.3 and 133m. The three processes contributing to the observed cross section are absorption into two kinds of continua, viz. the Herzberg continua of O 2 and a pressure-dependent continuum involving two molecules of O 2, and Rayleigh scattering. Extrapolation of the observed cross section to zero pressure yields the continuum cross section of O 2, from which the calculated Rayleigh scattering is subtracted to give the Herzberg continuum absorption cross section of O 2. Our previous continuum cross sections [Cheung et al. (1984) Can. J. Phys. 62, 1752], obtained from studies at high resolution (0.0013 nm) between the Schumann-Runge absorption lines in the region 194-204 nm, are here adjusted for Schumann-Runge line-wing contributions. These adjusted cross sections are compared with those calculated from computed Franck-Condon densities and a transition moment extrapolated from that calculated from our more accurate cross section measurements at longer wavelengths. Our calculated cross section in the region 195-237 nm is similar in shape to that calculated by Saxon and Slanger [J. geophys. Res., 91, 9877] from the transition moments computed ab initio by Klotz and Peyerimhoff [Molec. Phys., 57, 573]. Our values of the Herzberg continuum cross section of oxygen, tabulated at 1 nm intervals in the region 195-241 nm, increase from 6.3 × 10 -24 cm 2 at 195 nm to a maximum of 6.6 × 10 -24 cm 2 at 201 nm and then decrease to 0.85 × 10 24 cm 2 at 241 nm. Our results agree with those in the region 205-225 nm covered by the most recent previous laboratory study [Johnston et al. (1984) J. geophys. Res. 89, 11661] and are consistent with values in the region 200-220 nm spanned collectively by three in situ stratospheric studies [Frederick and Mentall (1982) Geophys. Res. Lett. 9, 461; Herman and Mentall (1982) J. geophys. Res. 87, 8967; Anderson and Hall (1983) J. geophys. Res. 88, 6801]. The larger Herzberg continuum cross sections found in another in situ stratospheric study [Pirre et al. (1984) Geophys. Res. Lett. 11, 1199] are in definite disagreement with our laboratory values, certainly in the region 205-214 nm. Our Herzberg continuum cross sections in the region 195-241 nm are significantly lower than those previously used in many photochemical stratospheric modelling calculations. Acceptance of our cross sections in such models will affect markedly the calculated altitude profiles of ozone, nitrous oxide, chlorofluorocarbons, and other trace stratospheric species. © 1986.en_HK
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/pssen_HK
dc.relation.ispartofPlanetary and Space Scienceen_HK
dc.titleAbsorption cross section measurements of oxygen in the wavelength region 195-241 nm of the Herzberg continuumen_HK
dc.typeArticleen_HK
dc.identifier.emailCheung, ASC:hrsccsc@hku.hken_HK
dc.identifier.authorityCheung, ASC=rp00676en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/0032-0633(86)90011-5-
dc.identifier.scopuseid_2-s2.0-0010819896en_HK
dc.identifier.volume34en_HK
dc.identifier.issue11en_HK
dc.identifier.spage1007en_HK
dc.identifier.epage1021en_HK
dc.identifier.isiWOS:A1986F182700001-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCheung, ASC=7401806538en_HK
dc.identifier.scopusauthoridYoshino, K=7401650773en_HK
dc.identifier.scopusauthoridParkinson, WH=7006361375en_HK
dc.identifier.scopusauthoridGuberman, SL=7003758696en_HK
dc.identifier.scopusauthoridFreeman, DE=23021313300en_HK

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