Secondary-electron yields of solar system ICES

Details Secondary-electron yields of solar system ICES Secondary-electron yields of solar system ICES

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..183s&link_type=abstract

Advances in Space Research, Volume 13, Issue 10, p. 183-187.

Physics

Space Physics

Scientific paper

The charging dynamics of ice particles in plasmas (e.g. for planetary ring dynamics) is highly dependent upon the secondary-electron yields of the ices. To this end, the secondary-electron yields of H2O, CO2, NH3 (ammonia) and CH3OH (methanol) ices have been measured in a scanning electron microscope as a function of the electron-beam energy in the 2-30 keV energy range. Estimates are given for the maximum secondary-electron yield Ymax of each ice and the energy Emax at which this maximum yield occurs and the implications of these estimates are discussed in terms of solar system ices. Based on these results and a general literature review of Ymax values for nonconducting materials, it is suggested that a typical range to quote for the secondary-electron yield of ices should be about 1-10. This is much lower than the range of 1-30 that is presently quoted in the space physics community.

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