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Measurements of argon broadened Lorentz width and pressure-induced line shift coefficients in the nu4 band of (C-12)H4Room temperature argon broadened halfwidth and pressure-induced line shift coefficients have been determined for 118 transitions in the nu4 band of (C-12)H4 from analysis of high resolution laboratory absorption spectra recorded with the McMath Fourier transform spectrometer operated on Kitt Peak by the National Solar Observatory. Transitions up to J-double-prime = 12 have been measured using a nonlinear least-squares spectral fitting procedure. The variation of the measured halfwidth coefficients with symmetry type and rotational quantum number is very similar to that measured previously for N2 and air broadening, but the absolute values of the argon broadening coefficients are all smaller. On average, the ratio of the argon broadened halfwidth coefficient to the corresponding N2 broadened halfwidth coefficient is 0.877 + or - 0.017 (2 Sigma). More than 95 percent of the pressure-induced shifts are negative with values ranging from -0.0081 to +0.0055/cm atm. The pressure shifts in argon are nearly equal to corresponding values measured previously in N2 and air.
Document ID
19890056136
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Rinsland, Curtis P.
(NASA Langley Research Center Hampton, VA, United States)
Smith, Mary Ann H.
(NASA Langley Research Center Hampton, VA, United States)
Devi, V. Malathy
(NASA Langley Research Center Hampton, VA, United States)
Benner, D. Chris
(College of William and Mary Williamsburg, VA, United States)
Date Acquired
August 14, 2013
Publication Date
June 1, 1989
Publication Information
Publication: Applied Optics
Volume: 28
ISSN: 0003-6935
Subject Category
Atomic And Molecular Physics
Accession Number
89A43507
Distribution Limits
Public
Copyright
Other

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