Measurements of air-broadened and nitrogen-broadened Lorentz width coefficients and pressure shift coefficients in the nu4 and nu2 bands of C-12H4

Details Measurements of air-broadened and nitrogen-broadened Lorentz width coefficients and pressure shift coefficients in the nu4 and nu2 bands of C-12H4 Measurements of air-broadened and nitrogen-broadened Lorentz width coefficients and pressure shift coefficients in the nu4 and nu2 bands of C-12H4

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apopt..27..631r&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 27, Feb. 1, 1988, p. 631-651. NASA-supported research.

Physics

Optics

52

Absorption Spectra, Fourier Transformation, Methane, Pressure Broadening, Spectrometers, Air, Least Squares Method, Lorentz Transformations, Nitrogen, Pressure Oscillations, Signal To Noise Ratios

Scientific paper

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.

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