. . "http://www.iso.org/iso/catalogue_detail?csnumber=31897"^^ . . . . . . . . . . "Energy Level"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "\"Energy Level\" is the ionization energy for an electron at the Fermi energy in the interior of a substance." . . "E" . . . . . . .