●物理化学 3-1 Covalence bond Theory E ∫wmvz∫(cw+cw2)(cw+Cw2r 十 dT E(C2+C2+2C,,)=CHn+C2H2+2C,C2 H2 H V HU at H12=h121 ∫v 11 22 12 21 E(C1+C2S2)=C1H1+C2H12 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 11   =       d H d E * * ˆ ( ) ( ) (   )       C C d C C H C C d 2 1 1 2 2 1 1 2 2 1 1 2 2   + + + = ˆ 22 1 2 12 2 11 2 2 1 2 12 1 2 2 2 E(C1 +C + 2C C S ) = C H +C H + 2C C H  H =  H d ij i j ˆ  S =  d ij i j E C1 +C2 S12 = C1 H11 +C2 H12 ( ) H11 = H22 H12 = H21 S11 = S22 = 1 S12 = S21 3-1 Covalence bond Theory