隧道效应和化学键的等价性

Equivalence of tunneling and chemical bond

用量子力学的含时微扰论来处理两个互相之间有弱耦合的原子系统A和B,可以同时得出隧道电导的表达式和化学键相互作用能的表达式.将这两个表达式进行比较,就可以得出隧道电导和化学键互作用能之间的一个普遍关系式.通过隧道效应和化学键力的同时测量,这个关系式已被多次准确地证实.由于隧道电导可以用Bardeen的曲面积分表达,而在很多情况下,Bardeen的曲面积分可以获得简单的解析表达式,因此,运用这个等价原理,可以建立化学键和磁性现象的新的近似解析理论.

By treating a weakly coupled pair of atomic systems A and B using time-dependent quantum-mechanical perturbation theory,an expression of tunneling conductance and an expression of chemical-bond interaction energy can be obtained. By comparing those two expressions,a universal relation between tunneling conductance and chemical-bond interaction energy is established. This relation was repeatedly verified by numerous experiments. Because tunneling conductance can be expressed by the Bardeen surface integral,which often results in simple analytic results,the above equivalence relation can provide a new approximate analytic theory on the chemical bond and magnetic phenomena.