Abstract
Negative ion and electron emission from the point contact, formed by a tungsten tip on lead–zirconium–titanate, has been produced by the application of two successive negative and positive voltage pulses and analyzed by a time-of-flight (TOF) mass spectrometer. No positive ions were detected with the used small pulse amplitudes. The electron emission is strong and in a form of very short (<3.5 ns) pulses. The TOF analysis indicates that both ions and electrons are emitted by Coulomb repulsion of uncompensated surface charges around the W tip.
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