Physics – Plasma Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dppbp1023s&link_type=abstract
American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congre
Physics
Plasma Physics
Scientific paper
Dust particles in interplanetary space can become charged through photoelectron emission by ultraviolet solar light. Additionally, dust particles can become charged through interaction with a UV-induced photoelectron sheath near the surface of larger space-borne objects. We have performed experiments to measure the photoelectric charging of single dust particles dropped through a beam of UV and dropped past a UV illuminated surface having a photoelectron sheath. The experiments are performed in vacuum, with illumination from a 1 kW Hg-Xe arc lamp having a minimum wavelength of ~ 200nm. The dust particles tested are 90-106 microns in diameter and are composed of zinc, copper, graphite, glass, SiC, JSC-1 (lunar regolith simulant) and JSC-Mars-1 (martian regolith simulant). The conducting materials charge in agreement with simple charging theory: positively when exposed to UV and negatively when interacting with the photoelectron sheath. Nonconducting materials exhibit a large amount of initial triboelectric charge. We will discuss the charges measured on each of these materials. ^* Work supported by NASA microgravity.
Colwell Joshua
Horanyi Mihaly
Robertson Scott
Sickafoose Amanda A.
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