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  • 1
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    Rotationally resolved collisional transfer rates in OH (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Fluorescence lidar measurements of the hydroxyl radical require detailed information concerning collision induced processes in order to deduce the radical number density from a lidar return. The Goddard SFC OH lidar currently utilizes a broadband detector which precludes the necessity of fully understanding collisional redistribution of rotational energy within the excited state. Numerous advantages result however from the inclusion of a detector with a bandpass only slightly larger that the Doppler width of a rotational line. This however places more stringent requirements on the spectroscopy. Measurements were accordingly made of rotationally resolved quenching rates for collisions with O2, N2, and H2O. Rotational transfer rates were also measured for the same colliders. Quenching rates were measured using a Nd-YAG pumped Rh6G dye laser doubled into the UV. The OH lifetimes were measured as a function of pressure of quenching gas at total pressures of between 50 and 250 microns. Rotational transfer rates were measured by recording the emission spectrum on an intensified diode array and integrating over 10.000 laser shots.
    Keywords: LASERS AND MASERS
    Type: NASA. Langley Research Center 13th International Laser Radar Conference; 1 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Excimer laser system for atmospheric remote sensing of ozone (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A high-power narrow-linewidth XeCl excimer laser system developed for use by NASA in the remote sensing of atmospheric ozone is described. The laser system is designed for incorporation in a DIAL lidar utilizing stimulated Raman generation for the reference wavelength and sophisticated data averaging techniques. The laser output has a linewidth of 0.002 nm and a beam divergence of 0.15 mrad (FWHM). The laser was operated over a six-hour period with a constant average power of 18 W and a wavelength stable to within + or - 0.0006 nm.
    Keywords: LASERS AND MASERS
    Type: Lasers ''86; Nov 03, 1986 - Nov 07, 1986; Orlando, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
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