Measurements of Photoelectric Yields of Individual Lunar Dust Grains

Details Measurements of Photoelectric Yields of Individual Lunar Dust Grains Measurements of Photoelectric Yields of Individual Lunar Dust Grains

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007esasp.643..165a&link_type=abstract

Workshop on Dust in Planetary Systems (ESA SP-643). September 26-30 2005, Kauai, Hawaii. Editors: Krueger, H. and Graps, A., p.1

Physics

1

Scientific paper

It is well known since the Apollo missions that just above the lunar regolith is a layer of levitated dust that is electrostatically charged by the incident solar UV radiation and by interaction with the solar wind. Photoelectric emissions induced by the UV radiation at photon energies higher than the work function of the grain materials, however, are recognized to be the dominant process for charging of the lunar dust in the sunlight. This requires measurement of the photoelectric yield of individual dust grains to determine their charge and equilibrium potentials.In this paper, we present the first laboratory measurements of the photoelectric yields of individual micron/sub-micron size dust grains selected from soil samples from the Soviet Luna-24 Mission. The experimental results on photoelectric emissions indicate that the yields are dust size dependent. The yields increase with the grain size by an order of magnitude from the sub-micron size to grains of several microns radii, at which they reach asymptotic values. The yields for large-size grains were determined to be more than an order of magnitude higher than the bulk measurements reported in the literature.

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