RECOMBINATION X-RAY LINE FORMATION OF IRON L-SHELL IONS IN LOW-TEMPERATURE PLASMAS

摘要

In low-temperature plasmas, X-ray line emission is dominated by radiative cascades following recombination and photoexcitation, with a negligible contribution from collisional excitation. In this paper, we present theoretical line formation rate coefficients for all n → 2 (3 ≤ n ≤ 5) transitions of Fe XVII-XXIV in the temperature range between 1 and 500 eV. Both radiative recombination (RR) and ΔN = 0 dielectronic recombination (DR) are taken into account. In addition, the rate coefficients for radiative recombination continua onto n = 2 and 3 states of Fe XVII-XXIV are tabulated. The total RR rate coefficients of Fe XVIII-XXV and total ΔN = 0 DR rate coefficients of Fe XVIII-XXIV are presented as well, and compared with existing experimental measurements and theoretical calculations.