UV Activation of Highly Mobile Electronic Charge Carriers in Gabbro and Gabbro Dust

Physics

Scientific paper

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1026 Composition Of The Moon, 3620 Mineral And Crystal Chemistry (1042), 3904 Defects, 5109 Magnetic And Electrical Properties (0925), 5470 Surface Materials And Properties

Scientific paper

UV irradiation activates highly mobile electronic charge carriers in igneous rocks including basalt, gabbro, and anorthosite. These charge carriers have the remarkable property that they can flow out of the irradiated surface layer and into the unirradiated part. They are defect electrons in the O2- sublattice, known as positive holes or pholes for short. Once activated, their lifetime is long. Traveling along the upper edge of the valence band, they cross grain boundaries. They can propagate over distances on the order of tens of centimeter or more. We have demonstrated that the phole charge carriers flow not only through solid gabbro but also through loosely compacted, finely divided gabbro dust. Being chemically equivalent to O- and, hence, to oxygen radicals, the pholes are highly reactive and highly oxidizing. If they are present in the lunar regolith, their chemical reactivity would have far-reaching consequences for human activity on the moon.

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