SEARCH Articles Figures Tables Band gap surface states Density of gap states Doping dependence of gap state energies Energy gap law for triplet states Metal-induced gap states Mid-gap states Normal-state gap Spectroscopic Studies of Gap States and Laser-Induced Structural Transformations in Se-Based As-Free Amorphous Semiconductors Spin state energy gap States within the band gap The singlet-triplet energy gap in CS states Xerographic Spectroscopy of States in Mobility Gap