Alkali, Cell and atoms, Electronic energy gap, Trigonal

• Mo-Rb-Se
• Mo-Rb-S
• F-K-Sn
• H-K-Ni-O
• Au-Rb-Se
• values of electronic energy gap
• energy gap for direct transition
• energy gap for indirect transition
• alkali
• chalcogen
• transitional
• non-disordered