dc.creator O'Brien, James J. en_US dc.creator Singh, K. en_US dc.date.accessioned 2006-06-15T15:33:31Z dc.date.available 2006-06-15T15:33:31Z dc.date.issued 1996 en_US dc.identifier 1996-TA-04 en_US dc.identifier.uri http://hdl.handle.net/1811/13598 dc.description ACKNOWLEDGEMENTS This work was supported by grant NAGW-2479 from the Planetary Atmospheres Program of NASA en_US dc.description Author Institution: Department of Chemistry and Center for Molecular Electronics, University of Missouri-St. Louis en_US dc.description.abstract The technique of intracavity laser spectroscopy has been used to obtain methane absorption spectra for the vibrational overtone bands that occur around 703 nm and 727 nm. Absorption coefficients for the 690-742 nm range have been obtained for a sample temperature of 77 k at a spectral resolution of $<0.02$ $cm^{-1}$. A new method of data analysis is utilized in obtaining the results. It involves deconvolving the many ILS spectral profiles that comprise the absorption bands and summing the results. Values averaged over $1 cm^{-1}$ and 1 \AA intervals are provided. Band strengths also are obtained. The total intensities of the 703 and 727 nm bands are in reasonable agreement with previous laboratory determinations which were obtained for relatively high pressures of methane at room temperature using lower spectral resolution. The methane bands appear in the reflected sunlight spectra from the outer planets. Results averaged over 1 nm intervals are compared with other laboratory studies and with those derived from observations of the outer planets. The band profiles differ considerably from other laboratory results but are in good accord with the planetary observations. Laboratory spectra of methane at appropriate conditions are required for the proper interpretation of the observational data. Absorption spectra can provide some of the most sensitive diagnostic data on the atmospheres of those bodies. en_US dc.format.extent 128433 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title ABSORPTION COEFFICIENTS AND BAND STRENGTHS FOR THE 703 NM AND 727 NM BANDS OF METHANE AT 77 K en_US dc.type article en_US
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