Secondary electron yields of solar system ices

Details Secondary electron yields of solar system ices Secondary electron yields of solar system ices

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.2611s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. E2, Feb. 25, 1992, p. 2611-2619. Research supported by DOE.

Physics

13

Ice, Interstellar Matter, Secondary Emission, Solar System, Ammonia, Carbon Dioxide, Electron Beams, Methyl Alcohol, Water

Scientific paper

The secondary electron yields of H2O, CO2, NH3, and CH3OH ices have been measured as a function of electron beam energy in the 2- to 30-keV energy range. The ices were produced on a liquid-nitrogen-cooled cold finger and transferred under vacuum to a SEM where the yield measurements were made. The imaging capabilities of the SEM provide a means of correlating the yield measurements with the morphology of the ices and are also used to monitor charging effects. The yields were determined by measuring the amplified current from a secondary electron detector and calibrating this current signal with the amplified current signal from samples of metals with known secondary electron yields. Each of the measured yields is found to decrease with an increase in energy in the 2- to 30-keV range. Estimates are given for the maximum secondary electron yield Y(max) of each ice and the energy at which this maximum yield occurs. Implications for the charging of solar system ice grains are discussed.

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