Physics – Atomic and Molecular Clusters
Scientific paper
2004-04-23
Physics
Atomic and Molecular Clusters
10 Pages, 7 Figures, To be presented at Electrostatic Applications Meeting, June 2004
Scientific paper
Static charge in and on the surface of pyroelectric crystals of LiNbO3 and LiTaO3 in a dilute gas has been shown to ionize gas molecules via electron tunneling. The released electrons and positive ions are focused and accelerated according to the sign of the static uncompensated charge. The uncompensated charge is produced when the temperature of the crystal is changed from any initial temperature between about 500K and about 15K. It may be either polarization charge that is inside the crystal surface or compensation charge that is on the surface. The direction of temperature change and the polarity of the base of the crystal determine whether electrons or positive ions are accelerated toward or away from the crystal. The ionization, focusing and acceleration may continue for more than 15 days following a single change in temperature.
Brownridge James D.
Shafroth Stephen M.
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