Theoretical Studies On Scatting Dynamics Of Low Energy Electron/Positive Electron With Nitrosyl Hydrochloride And Formaldehyde Molecules

With the advancement of science and the deepening of physics research,due to its wide application in biomedicine,astrophysics,imaging mechanisms,and plasma physics,the issue of collisions between electrons and molecules has received more and more attention.In the experimental study of scattering of electron molecules,people found that collision of low-energy electrons can cause DNA molecules to dissociate,which leads to the breakage of DNA strands.This phenomenon reveals the mechanism of low-energy electron-induced radiation damage to biomolecules.The introduction of the field of antimatter research brought positrons to the attention of researchers.Positrons have been widely used in material testing and medical treatment.For example,positron annihilation spectrometers have been used to test the characteristics of materials.Positron emission computed tomography imaging devices have played an important role in tumor diagnosis.Therefore,it is of great practical value and significance to study the scattering of electrons,positrons and molecular collisions and their dynamic processes.Although a large amount of scattering cross-section data is needed at present,due to the limitation of the method,it is still difficult to accurately describe the wave function and polarization effect of the scattering electrons and the target state.There are many simulations of electron,positron and molecular collision and scattering mechanisms.The problem needs to be solved.In this paper,we use the R-matrix method and use different calculation models to study the low-energy electrons and positron scattering processes of HNO molecules and formaldehyde molecules.The specific research contents are as follows:Firstly,the research status of scattering of electron molecules and scattering of positron molecules at home and abroad are introduced,including experimental and theoretical studies that have been reported.Then introduced the various methods and theories of electron/positron molecule scattering dynamics.The R-matrix method used in this paper is mainly introduced.Subsequently,we introduced the electron and positron scattering kinetics of HNO molecules using the R-matrix method.In the study of electron-molecular scattering,we detected the possible existence of electron-molecule resonances and marked them.We reported the elastic scattering integral and differential cross section,as well as the momentum transfer cross section.Finally,the R-matrix method was used to study the scattering kinetics of positrons and HNO and CH₂O molecules.The theoretical basis of positron scattering,program architecture,calculation methods and so on are introduced in detail.Through various models,we obtained the cross sections of HNO-positrons in different activation spaces and compared them.The feasibility of the method was verified by the comparison of the scattering data of CH₂O molecules with the experimental values.Since the polarization effect has an important influence on the results of positron collisions,we have also tested the effect of using different methods to deal with the effects of polarization effects on the cross-section.