Using static charge on pyroelectric crystals to produce self-focusing electron and ion beams and transport through tubes

摘要

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 500 and about 15 K. 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 from similar to20 to similar to160 to similar to20degreesC. Electron and ion transport through tubes is demonstrated. (C) 2004 Elsevier B.V. All rights reserved.