thermionic work function

thermionic work function

[‚thər·mē′än·ik ′wərk ‚fəŋk·shən]
(electronics)
Energy required to transfer an electron from the fermi energy in a given metal through the surface to the vacuum just outside the metal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.