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  • 1
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    Measurements of air-broadened and nitrogen-broadened Lorentz width coefficients and pressure shift coefficients in the nu4 and nu2 bands of C-12H4 (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Air-broadened and N2-broadened halfwidth and pressure shift coefficients of 294 transitions in the nu4 and nu2 bands of C-12H4 have been measured from laboratory absorption spectra recorded at room temperature with the Fourier transform spectrometer in the McMath solar telescope facility of the National Solar Observatory. Total pressures of up to 551 Torr were employed with absorption paths of 5-150 cm, CH4 volume mixing ratios of 2.6 percent or less, and resolutions of 0.005 and 0.01/cm. A nonlinear least-squares spectral fitting technique has been utilized in the analysis of the twenty-five measured spectra. Lines up to J double-prime = 18 in the nu4 band and J double-prime = 15 in the nu2 band have been analyzed.
    Keywords: GEOPHYSICS
    Type: Applied Optics (ISSN 0003-6935); 27; 631-651
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    High resolution spectroscopy to support atmospheric measurements (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Detailed knowledge of the molecular spectra of ozone and other infrared-active atmospheric species is needed for accurate calculation of atmospheric heating and cooling rates in climate models. Remote sensing experiments on the Nimbus-7 satellites and the Spacelab-3 Space Shuttle Mission have shown that space-based measurements of infrared absorption or emission can be used to accurately determine the concentrations and distributions of stratospheric species on a global scale. The objective of this research task is to improve knowledge of the spectroscopic line parameters (positions, intensities, assignments, halfwidths, and pressure-induced shifts) of key atmospheric constituents through laboratory measurements.
    Keywords: GEOPHYSICS
    Type: NASA, Washington, NASA Upper Atmosphere Research Program: Research Summaries 1988-1989; p 168-169
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Air-broadened Lorentz halfwidths and pressure-induced line shifts in the nu(4) band of C-13H4 (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Air-broadened halfwidths and pressure-induced line shifts in the nu(4) fundamental of C-13H4 were determined from spectra recorded at room temperature and at 0.01/cm resolution using a Fourier transform spectrometer. Halfwidths and pressure shifts were determined for over 180 transitions belonging to J-double prime values of less than or = to 16. Comparisons of air-broadened halfwidths and pressure-induced line shifts made for identical transitions in the nu(4) bands of C-12H4 and C-13H4 have shown that C-13H4 air-broadened halfwidths are about 5 percent smaller than the corresponding C-12H4 halfwidths, and the pressure shifts for C-13H4 lines are about 5-15 percent larger than those for C-12H4.
    Keywords: GEOPHYSICS
    Type: Applied Optics (ISSN 0003-6935); 27; 2296-230
    Format: text
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    NASA TECHNICAL REPORTS
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