5: Thermionic Emission - Tools for Science

5: Thermionic EmissionPurposeWhile we think of quantum mechanics being best demonstratedin processes that showdiscontinuous change, historically quantum mechanics wasfirst revealed in systems wherea large number of particles washed out the jumps: blackbody radiation and thermionicemission. In this lab you will investigate these two phenomena in addition to classicalspace-charge limited electron Emission : Child s , as demonstrated by their ability to conduct an electric current, contain mobileelectrons. (Most electrons in metals, particularly the core electrons closest to the nucleus,aretightly bound to individual atoms; it is only the outermost valence electrons that aresomewhat free .) These free electrons are generally confined to the bulk of the metal.

Thermionic Emission 105 l b anode cathode: hot filament, radius a anode cathode 1 4 2 Figure 5.2: Coaxial cylinders: an inner wire (radius a) and outer cylindrical anode (radius

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  Emissions, Cylindrical, Thermionic emission, Thermionic

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