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  • 1
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    Rovibrational intensities and electric dipole moment function of the X2 Pi hydroxyl radical (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Recent work aimed at determining the absolute rovibrational transition intensities for the ground electronic state of the hydroxyl radical is reviewed. Two new sets of Fourier transform emission spectra of OH are described which were recorded at the University of Paris and at the Kitt Peak National Solar Observatory.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073); 48; 5-6; p. 667-673.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    M dependence in the analysis of NH3-He microwave double resonance experiments (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: New close-coupled calculations of laboratory-frame, m-dependent cross sections for rotational excitation in NH3-He collisions are used to examined the validity of using degeneracy averaged values in the analysis of four-level double resonance experiments. It is found that the proper use of m-dependent cross sections and absorption probabilities produces only minor changes in the calculated Delta I/I (the fractional change in the signal absorption intensity when pumping radiation is applied) and does not, therefore, resolve the discrepancies between theoretical and experimental values that were noted in previous studies.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 78; Mar. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Rotational level-dependent collisional broadening and line shift of the A2Sigma(+)-X2Pi (1,0) band of OH in hydrogen-air combustion gases (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Measurements of the collisional broadening and line shift of the (1,0) band of the A2Sigma(+)-X2Pi system of OH are reported in atmospheric pressure hydrogen-air combustion gases. The measurements were made using a single-mode, narrow linewidth, frequency-doubled ring dye laser operating near 283 nm. The OH was generated in the combustion gases of a flat flame H2-air burner. Collisional broadening parameters for equilibrium mixtures of H2, O2, H2O, and N2 were obtained spanning a range of fuel/air equivalence ratios from 0.6 to 1.6 and temperatures from 1500 to 2050 K. Measurements were obtained spanning rotational quantum numbers from 4.5 to 16.5. The collision induced frequency shift was determined to be 0.1 that of the collisional broadening.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Quantitative Spectroscopy & Radiative Transfer (ISSN 0022-4073); 49; 2; p. 107-117.
    Format: text
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    NASA TECHNICAL REPORTS
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