. . . . . . . . . . . . . . . . "Gap Energy"@en . . . . . . . . . . . . . . "http://www.iso.org/iso/catalogue_detail?csnumber=31897"^^ . "http://en.wikipedia.org/wiki/Band_gap"^^ . . . . . . . . . . . . . "\"Gap Energy\" is the difference in energy between the lowest level of conduction band and the highest level of valence band. It is an energy range in a solid where no electron states can exist." . . . . . . . "E_g" . . .