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  • 1
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    Far-infrared self-broadening in methylcyanide - Absorber-perturber resonance (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Using tunable far-infrared spectrometers with high-frequency stability and accuracy, the self-pressure broadening and shift of CH3CN are measured. Evidence of absorber-perturber resonance effects on the collisional line shape are obtained. This tests the theoretical model and its possible improvements and also allows predictions of broadening and shift for a large class of molecules. Moreover, the resonance effect produces a theoretical temperature dependence of self-broadening that is different from what is commonly assumed.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physical Review A (ISSN 1050-2947); 45; 9 Ma
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Self broadening in the nu-1 band of NH3 (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Self-broadening coefficients, pressure shifts, and integrated intensities have been measured for Q- and R-branch transitions in the nu-1 fundamental band of ammonia using a difference-frequency laser spectrometer. A strong, systematic J and K dependence of the broadening coefficients, reminiscent of the ground-state inversion transitions, is observed and compared with semiclassical line broadening calculations. Dicke narrowing is evident at intermediate pressures for the sharpest lines, primarily the R(J, 0) transitions. Incipient line mixing is apparent in the Q branch at pressures above about 0.1 bar.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Quantitative Spectroscopy & Radiative Transfer (ISSN 0022-4073); 50; 2; p. 167-178.
    Format: text
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    NASA TECHNICAL REPORTS
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