Abstract book - Prof. Per Jensen, Ph.D. - Bergische Universität ...

180 Poster session, J17Multispectrum fitting to determine line parameters with temperaturedependence for the 2←0 bands of 12 C 16 O, 13 C 16 O, and 12 C 18 OV. Malathy Devi 1 , D. Chris Benner 1 , Mary Ann H. Smith 2 , Arlan W. Mantz 3 ,Keeyoon Sung 4 , Linda R. Brown 41 The College of William and Mary, Williamsburg, Virginia, U.S.A.; 2 NASA LangleyResearch Center, Hampton, Virginia, U.S.A., mary.ann.h.smith@nasa.gov;3 Connecticut College, New London, Connecticut, U.S.A.; 4 Jet Propulsion Laboratory,California Institute of Technology, Pasadena, California, U.S.A.Devi V.M.Benner D.C.Smith M.A.H.Mantz A.W.Sung K.Brown L.R.Line shape parameters were measured for three isotopologues of carbon monoxide;these include the Lorentz half-width coefficients with their temperature dependenceexponents; pressure-induced shift coefficients with their temperature dependences,speed dependence and off-diagonal relaxation matrix elements. For this, we recordedmore than 50 high resolution (0.005 cm −1 ) spectra of CO and two of its isotopologues( 13 CO and C 18 O) using a coolable absorption cell 1 in the sample compartment of theBruker IFS 125HR Fourier transform spectrometer at Jet Propulsion Laboratory (JPL).Air-broadened spectra with total pressures up to 700 Torr at temperatures between 150and 298 K were recorded for all three isotopologues; some self-broadened CO spectrawere also obtained using isotopically-enriched samples. Line parameters were retrievedby broad-band constrained multispectrum least-squares fitting 2 of 16 or more spectrasimultaneously. The individual line positions and intensities were constrained to theirtheoretical relationships in order to obtain the rovibrational (G, B, D, and H) and bandintensity parameters, including Herman-Wallis coefficients, as has been done for CO 2previously 3 . The air-broadening results for the 13 C 16 O and 12 C 18 O 2-0 bands 4 arecompared with each other and with those for the corresponding 12 C 16 O band 5 .Research described in this paper was performed at Connecticut College, the College ofWilliam and Mary, NASA Langley Research Center and the Jet Propulsion Laboratory,California Institute of Technology, under contracts and cooperative agreements with theNational Aeronautics and Space Administration.References[1] K. Sung, A. W. Mantz, M. A. H. Smith, et al., J Mol. Spectrosc. 262, 122, 2010.[2] D. C. Benner, C. P. Rinsland, V. Malathy Devi, M. A. H. Smith and D. A. Atkins, JQuant. Spectrosc. Radiat. Transfer 53, 705, 1995.[3] V. Malathy Devi, D. C. Benner, L. R. Brown, C. E. Miller and R. A. Toth, J Mol.Spectrosc. 242, 90, 2007.[4] V. Malathy Devi, D. C. Benner, M. A. H. Smith, et al., J Quant. Spectrosc. Radiat.Transfer 113, 1013, 2012.[4] V. Malathy Devi, D. C. Benner, M. A. H. Smith, et al., J Mol. Spectrosc., in press,2012.