DEFINITION OF ELECTRON ENERGY SPECTRUM ZONE STRUCTURE IN APPROXIMATION OF SPHERICAL WIEGNER-SEITS CELLS WITH USE OF QUASI-PULSE-ORDER SERIES EXPANSION

V. G. Novikov, V. B. Uvarov
Vant. Ser. Metodiki i Programmy Chislennogo Resheniya Zadach Matematicheskoy Fiziki 1981. Вып.2. С. 39-41.

      Quasi-pulse-order series expansion is obtained for energy and wave functions of electrons in energy zone in approximation of spherical Wiegner-Seitz cells. Recursion formulas are developed to calculate the coefficients of this expansion.