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Self-Broadening and Self-Shift Coefficients in the Fundamental Band of 12C 16OHigh quality and precise measurements of self-broadened and self-shift coefficients in the fundamental band of C-12O-16 were made using spectra recorded at room temperature with the high-resolution (0.0027 cm(exp -1)) McMath-Pierce Fourier transform spectrometer located at the National Solar Observatory on Kitt Peak, Arizona. The spectral region under investigation (2008-2247 cm(exp -1)) contains the P(31) to R(31) transitions. The data were obtained using a high-purity natural isotopic sample ofcarbon monoxide and two absorption cells with pathlengths of 4.08 and 9.98 cm, respectively. Various pressures of CO were used, ranging between 0.25 and 201.2 Torr. The results were obtained by analyzing five spectra simultaneously, using a multispectrum nonlinear least-squares fitting technique. The self-broadened coefficients ranged from 0.0426(2) cm(exp -1) atm(exp -1) at 296 K to 0.0924(2) cm(exp -1) atm(exp -1) at 296 K, while the pressure-induced shift coefficients varied between -0.0042(3) cm(exp -1) atm(exp -1) at 296 K and +0.0005(l) cm(exp -1) atm(exp -1) at 296 K. The value in parentheses is the estimated uncertainty in units of the last digit. The self-broadened coefficients of lines with same values of m in the P and R branches agree close to within experimental uncertainties while the self-shift coefficients showed considerable variation within and between the two branches. The mean value of the ratios of P branch to R branch self-broadened coefficients was found to be 1.01 with a standard deviation of + or - 0.01. Comparisons of the results with other published data were made.
Document ID
19990028510
Acquisition Source
Langley Research Center
Document Type
Reprint (Version printed in journal)
Authors
Devi, Malathy V.
(College of William and Mary Williamsburg, VA United States)
Benner, D. Chris
(College of William and Mary Williamsburg, VA United States)
Smith, Mary Ann H.
(NASA Langley Research Center Hampton, VA United States)
Rinsland, Curtis P.
(NASA Langley Research Center Hampton, VA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1998
Publication Information
Publication: Journal Quant. Spectroscopy and Radiative Transfer
Publisher: Elsevier Science Ltd.
Volume: 60
Issue: 5
ISSN: 0022-4073
Subject Category
Inorganic And Physical Chemistry
Distribution Limits
Public
Copyright
Other

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