Electronic structures of impurities and point defects in semiconductors
Zhang Yong †
       

Hydrogen model for a Cl vacancy in NaCl given by Tibbs (1939).[2] Above: potential energy of an electron in the field of a vacant Cl lattice point (full line). The broken line represents −e2/(ε0r). Below: the envelope wave functions of an electron in a Cl vacancy. + for Na+ ions, • for Cl− ions. Source: Mott and Gurney.[8]