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类氖等电子系列离子基态的双电子复合速率系数研究
The study of dielectronic recombination (DR) rate coefficient for ground state of Ne-like isoelectronic sequence ions
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摘要: 使用全相对论组态相互作用方法，能级-能级细致计算了0．1EI≤kTe≤10EI（EI是类钠离子基态的第一电离能）温度范围内类氖离子基态双电子复合（DR）速率系数，双激发自电离能级考虑了（2s2p）73ln′l′，（2s2p）74l4l′以及（2s2p）74l5l′组态．对于（2s2p）73ln′l′双激发自电离组态，轨道角量子数l′〉8的（2s2p）73ln′l′双激发自电离态对双电子复合速率系数的贡献可以忽略不计；（2s2p）73ln′l′双激发自电离组态的高里德堡态对双电子复合速率系数的贡献满足n′-3组态-组态外推法，并且核电荷数越大，趋于n′-3标度的n′值越小；对细致能级计算得到的类氖离子基态的总DR速率系数进行了拟合，得到类氖离子基态的总DR速率系数随核电荷数Z和电子温度变化的经验公式，该拟合公式与细致计算结果的偏差在2％以内，能较准确的计算任意核电荷数Z的类氖离子在0．1EI≤kTe≤10EI电子温度范围的DR速率系数．Burgess-Merts（BM）近似公式不适用于估算低温（kTe〈0．3EI）类氖离子的DR速率系数，在高温（kTe〉2EI）时，类氖离子的DR速率系数可以用BM近似公式表示．Abstract: The dielectronic recombination (DR) rate coefficients for Ne-like isoelectronic sequence ions in the ground state 2s22p6 are calculated by using relativistic configuration interaction (RCI) method over a wide temperature ranging from 0.1EI to 10EI where EI is the ionization energy of corresponding Na-like ion. The (2s2p)73ln′l′, (2s2p)74l4l′ and (2s2p)74l5l′ complexes are considered as autoionizing doubly excited states of Ne-like ions in the calculation. The contribution of (2s2p)73ln′l′ complex with l′ 〉 8 is found to be negligible. The contribution of high Rydberg states of (2s2p)73ln′l′ complex obeys the complex-complex n′-3 extrapolation, and the larger the nuclear charge, the smaller the value of n′ is. On the basis of the detailed level-by-level results, a general analytic formula for the total DR rate coefficient for all the ions along the Ne-like isoelectronic sequence is constructed. This formula can generally reproduce the calculated DR rate coefficients within 2% for electron temperature between 0.1EI and 10EI. Burgess-Merts semiempirical formula is found to be inadequate for predicting the DR rates of Ne-like ions at low electron temperatures (kTe 〈 0.3EI) and may be used for high electron temperatures (kTe 〉 2EI).
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