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Work Function

Applicable units are those of quantitykind:Energy

"Work Function" is the energy difference between an electron at rest at infinity and an electron at a certain energy level. The minimum energy (usually measured in electronvolts) needed to remove an electron from a solid to a point immediately outside the solid surface (or energy needed to move an electron from the Fermi level into vacuum).

http://en.wikipedia.org/wiki/Work_function

http://www.iso.org/iso/catalogue_detail?csnumber=31897

$\Phi$

"Work Function" is the energy difference between an electron at rest at infinity and an electron at a certain energy level. The minimum energy (usually measured in electronvolts) needed to remove an electron from a solid to a point immediately outside the solid surface (or energy needed to move an electron from the Fermi level into vacuum).