Abstract
Abstract We have recently reported the ionization of calcium atoms through resonant laser pumping of 3P metastable states. There, it was concluded that the rapid avalanche of ionization is mainly carried through by superelastically heated electrons. It was suggested that the ‘seed’ electrons may be provided by thermionic emission. In order to confirm this we have now investigated the nature of thermionic emission in our experiment. Besides confirming this, it was found that the emission was from calcium metal and other metallic surface coated with layers of calcium.
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