Extension of variation method EEE V For a wave function o which is orthogonal to the ground state wave function v,i.e dτdv1=0 E=dP/Jdrp≥E2 the first excited state energy. . . E3 y3 E2 y2 E1 y1 Extension of Variation Method For a wave function f which is orthogonal to the ground state wave function y1 , i.e. dt f * y1 = 0 Ef = dt f *Hf / dt f *f > E2 the first excited state energy