●物理化学 3-1 Covalence bond Theory FE 0 (H1-EC1+(H12-ES12)C2=0 inax aCI f aggeneys OE 0 (Hn2-Esn2C+(H22-ecr=0 equations aC Secular determinant H-E H-ES 12 0 12 Es H-E 12 22 、H1+H12 E n1-112 1+S12 12 y1+y -l2 2+2S12 2-2S 12 2021/8/21 复旦大学化学系物理化学I 2021/8/21 复旦大学化学系 12 (H11 − E)C1 + (H12 − ES12)C2 = 0 (H12 − ES12)C1 + (H22 − E)C2 = 0 0 1 =   C E 0 2 =   C E 0 1 2 1 2 2 2 1 1 1 2 1 2 = − − − − H ES H E H E H ES 12 11 12 1 S H H EI + + = 12 11 12 1 S H H EII − − = 12 1 2 2 2S I + + =    12 1 2 2 2S II − − =    Secular determinant Linear homogeneous equations 3-1 Covalence bond Theory