The Study About Dielectric Characters Of Molecule H₂O

The study of single molecule is not about the average behavior of a huge number of same molecules, but is intended to describe the behavior of one separate molecule. The primary problem of life science is the activity of single molecule in living cells. In recent years, people give more and more attention to the research of single molecule. In the project-"some advanced researches in theoretical physics and interdisciplinary subjects", National Nature Science Foundation of China confirms single-molecular biophysics as a specific direction.Single-molecular dynamics is one of the main problems of the single-molecular biophysics, which has great significance to both physical scientists and biologists. The force to one separate molecule can be distributed into two classes: one is the interactions of each inner part in this molecule; the other is the interactions between this molecule and other particles in the same surroundings. All the interactions can only be originated from electric and magnetic functions. Compared with electric function, the magnetic function can be ignored. It is necessary to analyze and study the dielectric characters of surroundings in order to quantitatively analyze and describe the interactions relative to single molecule.Because water is one of the most important molecules for the life and is the main component of cell sap, it is fundamental to research dielectric characters of H₂O. We carry out the computation by using GaussianO3, and we get data of electric dipole moment of molecule H2O in all directions when it is put in strong electric field and the data of microcosmic polarizability tensor. Our data are useful supplement to the previous work.We will carry on further calculation and expect to get dielectric characters of complex practical cell sap.