Theoretical Study On The Dielectronic Recombination Of Tungsten And Gold Ions

Dielectronic recombination（DR） is looked as an important phenomenon of electrons-ions inelastic collisions. It is an important process of atomic dynamics.The knowledge of accurate dielectronic recombination rates of heavy ions is crucial for the study of ionization balance of highly ionized elements in hot plasmas. The process therefore plays an important role in the theoretical modeling of plasmas, whether in the laboratory or in astrophysical sources such as the solar corona. Theoretical calculations have been made for dielectronic recombination（DR） rate coefficients of W²⁸⁺ ions using a flexible relativistic atomic code. The contributions from 3l、4s、4p and 4d sub-shell excited are discussed. The l’ dependences of the partial rate coefficients for(3d¹⁰4s²4p⁶4d¹⁰)-1nln’l’ are investigated. The total DR rate coefficients considering various important factor shows that radiative cascades（ DAC） are very important. In order to facilitate applications, the fitting parameters with error of 1% have been given.Theoretical calculations have been also made for dielectronic recombination（DR）rate coefficients of Au³³⁺ ions using a flexible relativistic atomic code. High charged state Au can obtain high absorption efficiency and X ray high optical conversion efficiency. It is regarded as the ideal target materials in inertial confinement fusion.The contributions from DAC of 4d⁹4f15 p is 35.16%. So DAC must be considered in DR rate coefficient calculations. 4d sub-shell excited to difference shells are discussed.It is found that the DR rate coefficients of n=4 is the biggest and the n=6（ The contribution is 13.1 % to total）can not be ignored. It is also studied that DR rate coefficients of 3d and 4l are excited. In the whole temperature range, The contributions from 4d is the biggest, and the contributions of 3d electron is 9.8%.