The emission of electrons from a heated source.
- However, Carnap's principal interest at that time was in physics, and by 1913 he was planning to write his dissertation on thermionic emission.
- After graduating, he began a research project in the Cavendish Laboratory on thermionic emission but it appears not to have gone too well and he gave up the project.
- The gas, primarily consisting of cathode material, expands into the vacuum where it is ionised by bombardment from the thermionic emission due to the very hot underlying cathode.
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