Excitation energies, radiative and autoionization rates, dielectronic satellite lines, and dielectronic recombination rates for excited states of Na-like W from Ne-like W

摘要

Energy levels, radiative transition probabilities, and autoionization rates for 1s(2)2s(2)2p(5)3l'nl, 1s(2)2s(2)p(6)3l'nl (n = 3-7 l <= n - 1) and 1s(2)2s(2)2p(5)4l'nl, 1s(2)2s(2)p(6)4l'nl (n = 4-6 1 <= n - 1) states in Na-like tungsten (W63+) are calculated. Cowan's relativistic Hartree-Fock method, the relativistic multiconfiguration method implemented in the Hebrew University Lawrence Livermore Atomic Code, and the relativistic many-body perturbation theory method, are used. Autoionizing levels above the threshold 1s(2)2s(2)2p(6) are considered. It is found that configuration mixing [3sns + 3pnp + 3dnd], [3snp + 3pns + 3pnd + 3dnp] plays an important role for all atomic characteristics. Also strong mixing between states with 2s and 2p holes (1s(2)2s(2)2p(5)3l(1)nl(2) + 1s(2)2s2p(6)3l(3)nl(4)) Occurs. Branching ratios relative to the first threshold and intensity factors are calculated for satellite lines, and dielectronic recombination (DR) rate coefficients are determined for the excited 1s(2)2s(2)2p(6)nl (n = 3-7, l <= n - 1) states. It is shown that the contribution of the highly excited states is very important for calculation of total DR rates. Contributions from the autoionizing states 1s(2)2s(2)2p(5)3l'nl, 1s(2)2s(2)p(6)3l'nl (n >= 8) and 1s(2)2s(2)2p(5)4l'nl, 1s(2)2s(2)2p(6)4l'nl (n >= 7) to the DR rate coefficients are estimated by extrapolation of all atomic parameters. The orbital angular momentum (l) distribution of the rate coefficients shows a peak at l = 2. The total DR rate coefficient is derived as a function of electron temperature. The dielectronic satellite spectra of W63+ are important for L-shell diagnostics of very high-temperature laboratory plasmas such as future ITER fusion plasmas.