Anisotropic Effect On The Reduction Factors And Energy Of Vibronic Coupling Systems

During recent decades, the vibronic coupling has already become one of the important issues incondensed matter physics because of its important physical properties and influence on differentphysical regions. It's also one mode of interactions which must be considered in researches ofthis area. In this dissertation, we adopted the analytical method and analog numerical calculationto the vibronic coupling systems of E(?)e and T(?)t. The vibronic coupling properties andreduction factors which change along with coupling strength were discussed, in order to providea theoretical basis for relevant experiments. Under the scheme of adiabatic approximation, westudied the adiabatic potential energy of E(?)e system by unitary transformation, and exploredthe anisotropic effect on potential energy surface; then we studied the effect of anisotropy onsystem energy. Because the reduction factors can reflect the screening effect of coupling reactionon spin-orbit coupling,external stress,internal stress and other physical quantities, it couldgreatly help us to understand the nature of interactions within materials. In such a dissertation,we also explored the first-order reduction factors and their relationships in the E(?)e and T(?)tsystems; on the basis of linear terms, we separately studied the effect caused by anisotropy onthe overlaps of potential wells,first-order reduction factors and Ham's formula. The resultindicated that anisotropy not only causes the distortion of adiabatic potential surface, but alsoimpacts on reduction factors in different vibronic coupling area, and then provided some usefultheoretical basis for relevant experiments.