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  • 1
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    Stable isotope analysis using tunable diode laser spectroscopy (1992)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Ratios of C-12/C-13 in CO2 have been measured using a tunable diode laser (TDL) spectrometer to an accuracy of better than 0.4 percent. These results were made possible by the use of state-of-the-art high-temperature TDLs, an etalon and wavenumber calibration technique, high-speed assembly language controlled data acquisition, and the ratioing of absorbances from simultaneously acquired sample and reference data scans. The dual beam spectrometer that is employed uses the sweep integration technique in a spectral region where adjacent spectral lines are of approximately equal absorbance at the expected isotopic abundances.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Applied Optics (ISSN 0003-6935); 31; 12:00 AM
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Line-width temperature dependence of selected R-branch transitions in the nu-3 fundamental of (N-14)2O-16 between 135 and 295 K (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Tunable diode laser spectroscopy has been used to measure the temperature dependence of N2 foreign gas broadening coefficients for eight R-branch transitions in the nu-3 fundamental of (N-14)2O-16 at 135, 176, 210, and 295 K. The exponent n of the relation for quadrupole-quadrupole collisional interactions is found to range from 0.66 to 0.71, in approximate agreement with the theoretically predicted value of 0.75.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Spectrochimica Acta (ISSN 0584-8539); 48A; 9; p. 1243-1248.
    Format: text
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    NASA TECHNICAL REPORTS
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