DYNAMICAL SCREENING EFFECTS ON RATE COEFFICIENTS FOR DENSE PLASMAS

摘要

Usually collisional rate coefficients in plasmas are calculated from cross sections for the respective processes averaged with the electron distribution function. The cross sections are taken from scattering theory or scattering experiments referring to processes of isolated particles. In dense plasmas, however, there have to be taken into account many-particle effects like screening, lowering of the ionization energy and Pauli-blocking. These can be included into the theory if one starts from quantum kinetic equations for nonideal systems with chemical reactions. Statistical expressions can be derived for the rate coefficients now taking into account many-body effects.