Large-scale calculation of dielectronic recombination parameters for Mg-like Fe
Large-scale calculation of dielectronic recombination parameters for Mg-like Fe
复制标题
类镁铁双电子复合参数的大规模计算
DOI：
10.1088/0953-4075/39/14/001
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Yuri Ralchenko
中科院分区：
文献类型：
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作者：
Izumi Murakami;Takako Katō;Daiji Kato;U. Safronova;T. Cowan;Yuri Ralchenko
采用hartrei - fock相对论方法（Cowan码）和相对论多体微扰理论方法（RMBPT码）计算了类mg铁（Fe14+）中1s22s22p63l 'nl （n = 3-12, l≤n−1）和1s22s22p64l 'nl （n = 4-7, l≤n−1）态的能级、辐射跃迁概率和自离率。考虑高于三个阈值1s22s22p63s、1s22s22p63p和1s22s22p63d的自电离能级。发现构型混合[3sns + 3pnp + 3nd]和[3snp + 3pns + 3pnd + 3dnp]对所有原子特性都起着重要作用。计算了卫星线相对于第一阈值和强度因子的分支比，确定了444个奇宇称和419个偶宇称激发态的介电子复合（DR）速率系数。结果表明，高激发态的贡献对于计算总DR率是非常重要的。从具有n大于或等于12的激发态1s22s22p63l 'nl状态和具有n大于或等于7的1s22s22p64l 'nl状态到DR速率系数的贡献通过所有原子参数的外推来估计。推导出总DR速率系数作为电子温度的函数。
Energy levels, radiative transition probabilities and autoionization rates for 1s22s22p63l′nl (n = 3–12, l ⩽ n − 1) and 1s22s22p64l′nl (n = 4–7, l ⩽ n − 1) states in Mg-like iron (Fe14+) are calculated by the Hartree–Fock-relativistic method (Cowan code) and the relativistic many-body perturbation theory method (RMBPT code). Autoionizing levels above three thresholds 1s22s22p63s, 1s22s22p63p and 1s22s22p63d are considered. It is found that configuration mixings [3sns + 3pnp + 3dnd] and [3snp + 3pns + 3pnd + 3dnp] play an important role for all atomic characteristics. 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 444 odd-parity and 419 even-parity states. It is shown that the contribution of the highly-excited states is very important for calculation of total DR rates. Contributions from the excited 1s22s22p63l′nl states with n ⩾ 12 and 1s22s22p64l′nl states with n ⩾ 7 to DR rate coefficients are estimated by extrapolation of all atomic parameters. The total DR rate coefficient is derived as a function of electron temperature.