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Measurements of Band Intensities, Herman-Wallis Parameters, and Self-Broadening Line-Widths of the 30011 - 00001 and 30014 - 00001 Bands of CO2 at 6503 cm(exp -1) and 6076 cm(exp -1)Rotationless band intensities and Herman-Wallis parameters are listed in HITRAN tabulations for several hundred CO2 overtone-combination bands. These parameters are based on laboratory measurements when available, and on DND calculations for the unmeasured bands. The DND calculations for the Fermi interacting nv(sub 1) + v(sub 3) polyads show the a(sub 2) Herman-Wallis parameter varying smoothly from a negative value for the first member of the polyad to a positive value for the final member. Measurements of the v(sub 1) + v(sub 3) dyad are consistent with the DND calculations for the a(sub 2) parameter, as are our recent measurements of the 4v(sub 1) + v(sub 3) pentad. However, the measurement-based values in the HITRAN tables for the 2v(sub 1) + v(sub 3) triad and the 3v(sub 1) + v(sub 3) tetrad do not support the DND calculated values for the a(sub 2) parameters. We therefore decided to make new measurements to improve some of these intensity parameters. With the McMath FTS at Kitt Peak National Observatory/National Solar Observatory we recorded several spectra of the. 4000 to 8000 cm(exp -1) region of pure CO2 at 0.011 cm(exp -1) resolution using the 6 meter White absorption cell. The signal/noise and absorbance of the first and fourth bands of the 3v(sub 1) + v(sub 3) tetrad of C-12O-16 were ideal on these spectra for measuring line intensities and broadening widths. Our selfbroadening results agree with the HITRAN parameterization, while our measurements of the rotationless band intensities are about 15% less than the HITRAN values. We find a negative value of a(sub 2) for the 30011-00001 band and a positive value for the 30014-00001 band, whereas the HITRAN values of a(sub 2) are positive for all four tetrad bands. Our a(sub 1) and a(sub 2) Herman-Wallis parameters are closer to DND calculated values than the 1992 HITRAN values for both the 30011-00001 and the 30014-00001 band.
Document ID
20020028399
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Giver, L. P.
(NASA Ames Research Center Moffett Field, CA United States)
Brown, L. R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Wattson, R. B.
(Stewart Radiance Lab. Bedford, MA United States)
Spencer, M. N.
(NASA Ames Research Center Moffett Field, CA United States)
Chackerian, C., Jr.
(NASA Ames Research Center Moffett Field, CA United States)
Strawa, Anthony W.
Date Acquired
August 20, 2013
Publication Date
January 1, 1995
Subject Category
Physics (General)
Meeting Information
Meeting: 50th International Symposium on Molecular Spectroscopy
Location: Columbus, OH
Country: United States
Start Date: June 12, 1995
End Date: June 16, 1995
Funding Number(s)
PROJECT: RTOP 154-50-80
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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