Theoretical Investigation of Dielectronic Recombination Rate Coefficients ofW⁴⁴⁺ Ions

Key words: 
• dielectronic recombination /
• DR rate coefficient /
• W⁴⁴⁺ ions

Abstract: Based on the fully relativistic configuration interaction method, theoretical calculations are carried out to research the dielectronic recombination (DR) processes, in which W44+ ions in the ground state 3s²3p⁶3d¹⁰4s² trap an electron to form doubly excited states (3s²3p⁶3d¹⁰4s²)nln^’l’(n =4~6，n′= 4~7). The comparison of the DR rate coefficients of different shells shows that DR approach is as follow: the 4s subshell excitation dominates to DR at low temperature, but 3d subshell excitation attributes to DR at high temperature. Total DR rate coefficients from n=4~18 are evaluated directly, and the results are extrapolated up to n = 100 in the temperature range from 1 to 5×10⁴ eV, and thus get the total DR rate coefficients. Compared total DR rate coefficients to three-body recombination (TBR) rate coefficients and radiative recombination (RR) rate coefficients, it showed that the total DR rate coefficients obviously significantly greater than other two recombination rate coefficients, and thus it obviously influence ionization equilibrium and ionization state population of ITER plasma.