Fermi level, Math - title
The chemical potential of electrons in a solid (metals, semiconductors or insulators) or in an electrolyte solution.
See: bandgap energy, conduction band, valence band
PAC, 1996, 68, 2223 (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2242
See also:
PAC, 1986, 58, 437 (Interphases in systems of conducting phases (Recommendations 1985)) on page 440