●物理化学 3-1 Covalence bond Theory +n+v(R,r)=EV(R 2 2M 2M 12 R B.O. Approximation 2 b2 2 R Oppenheimer a b +n+u(r)=E(R)u(r) 72 2 tb 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 8 Rab 12 r b2 r a1 r a b 1 2 a2 r b1 r (R,r) E (R,r) M M r r r r R r a a b b a b a b   =       −  −  −  −  − − − − + + 1 2 1 2 1 2 2 2 2 2 2 1 1 1 1 1 1 1 2 1 2 1 2 1 2 1 (r) E(R) (r) r r r r R r a a b b a b   =       −  −  − − − − + + 1 2 1 2 1 2 2 2 2 1 1 1 1 1 1 1 2 1 2 1 B.O. Approximation Oppenheimei 3-1 Covalence bond Theory