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  • Other Sources  (2)
  • 1980-1984  (2)
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  • 1
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    Homogeneous condensation - Freezing nucleation rate measurements for small water droplets in an expansion cloud chamber (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Experimental data on ice nucleation, presented in an earlier paper, are analyzed to yield information about the homogeneous nucleation rate of ice from supercooled liquid and the heights of energy barriers to that nucleation. The experiment consisted of using an expansion cloud chamber to nucleate from the vapor a cloud of supercooled pure water drops and the observation of the fraction of drops which subsequently froze. The analysis employed standard classical homogeneous nucleation theory. The data are used to extract the first experimental measurement (albeit indirect) of the activation energy for the transfer of a water molecule across the liquid-ice interface at temperatures near -40 C. The results provide further evidence that the local liquid structure becomes more icelike as the temperature is lowered.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Journal of the Atmospheric Sciences; 38; June 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Ion beams from laser-generated plasmas (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper describes the space-charge-limited beams produced by the plasma blowoffs generated by 20-MW bursts of 1.06-micron radiation from an active Q-switched Nd:YAG laser. Laser power densities near 10 to the 11th/sq cm on solid targets generate thermalized plasma plumes which drift to a 15-kV gridded extraction gap where the ions are extracted, accelerated, and electrostatically focused; the spatially defined ion beams are then magnetically analyzed to determine the charge state content in the beams formed from carbon, aluminum, copper, and lead targets. This technique preserves time-of-flight (TOF) information in the plasma drift region, which permits plasma ion temperatures and mass flow velocities to be determined from the Maxwellian ion curve TOF shapes for the individual charge species.
    Keywords: PLASMA PHYSICS
    Type: Journal of Applied Physics; 51; Aug. 198
    Format: text
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    NASA TECHNICAL REPORTS
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