Vibronic coupling density : understanding molecular deformation This book introduces vibronic coupling density and vibronic coupling constant analyses as a way to understand molecular structure and chemical reactions. After quantum study the behavior of electrons circulating around nuclei led to the principal concept that underlies all explanations in chemistry. Many textbooks have given plausible explanations to clarify molecular structure or example the bond elongation of ethylene under anionization and the nonplanar structure of ammonia. Frontier molecular orbital concepts were proposed to visualize the path of chemical reactions and conventional explanations gave students a familiarity with molecular structures in terms of the electronic state. By contrast this book offers a more rational and more convincing path to understanding. It starts from the ab initio molecular Hamiltonian and provides systematic rational approaches to comprehend chemical phenomena. In this way the book leads the reader to a grasp of the quantitative evaluation of the force applied under the molecular deformation process. As well guidelines are offered for integrating the traditional and waving approach of chemistry with more rational and general VCD and VCC alternatives along with the outlook for newly functionalized chemical systems