The appearance of things is complicated, but the essence is simple. It has beenapproved by many scientific theorems, rules, principles and theories. The authoralways adheres to this idea in order to reach the essence of things during the construc-tion of Weakest Bound Electron Theory (WBE Theory)and the writing of thisbook.
The author introduced the idea of the weakest bound electron into theoreticalchemistry, and constructed the WBE theory based on the wave-particle duality. It notonly satisfies the requirements for the indistinguishability of identical particles andPauli Exclusion Principle, but also underlines the properties of single particle andprovides a theoretical basis for approximate separability between particles.
Hydrogen, one of the single-electron systems which are exactly soluble inquantum mechanics, has an electron which is the weakest bound electron in itssystem; therefore, it should be included in the theory.
It is very difficult to incorporate the wave-particle duality into the quantum theoryofelectron structures,and re-produce the properties and rules of atoms and molecules.This has been indicated by the establishment and development of all kinds of quantumtheories and methods. Although currently the WBE theory and applications are justa framework, there is no doubt that it not only has to include, expand and improvethe achievements from all available quantum theories and methods, but also makecommunications between different theories and methods based on wave-particleduality.
The author hopes that the WBE theory would bring new information and makecontributions for the development and application of quantum theory.
Thanks to the students in my laboratory. They not only give me the joy ofworking together, but also make contributions to the development and applicationof the theory. Thank the older generation of scientists and friends for their helpin my research. They are Mr. Ao-Qing Tang(唐敖慶，Academician of ChineseAcademy of Sciences), Mr. Guang-Xian Xu(徐光憲，Academician of ChineseAcademy of Sciences),Mr.Le-Min Li(黎樂(lè)民， Academician of Chinese Academy ofSciences),Prof. Ke-Min Yao(姚克敏，Zhejiang University), Prof.Xiang-Lin Zhang(張祥林，Central South University), Prof.Qian-Shu Li(李前樹(shù)，Beijing University of Technology), Prof. Yao-Quan Chen(陳耀全， Chinese Academy of Sciences),Prof. Xiao-Yin Hong(洪嘯吟，Tsinghua University), Prof.Han-Bao Feng (馮漢保，National Natural Science Foundation of China), Prof.Xiang-Lin Jin(金祥林，PekingUniversity), Prof.Jia-Ju Zhou(周家駒， Chinese Academy of Sciences) and Rui-ShuWang(王瑞書(shū)， Editor-in-chief of Jiangsu Phoenix Education Publishing House).Thank Ms. Zhe-Feng Gao(高哲峰) and other staffs from the University of Scienceand Technology of China Press for their effort to make this book publish. Finally, Iam deeply grateful to my parents, my wife You-Xian Xu(徐幼仙) and children fortheir love, support and assistance.
Hefei, China
Neng-Wu Zheng