Validity of analytical formulas for autoionization and dielectronic capture rates used in collisional-radiative models
Validity of analytical formulas for autoionization and dielectronic capture rates used in collisional-radiative models
复制标题
碰撞辐射模型中使用的自电离和双电子捕获率分析公式的有效性
DOI：
10.1103/physreva.82.062515
复制
发表时间：
2010-12
影响因子：
2.9
通讯作者：
中科院分区：
文献类型：
--
作者：
通过包括足够的电子相关性，进行了大规模的逐级计算，以获得尽可能准确的类镍 Au{sup 51+} 和类铜 Au{sup 50+} 的自电离和双电子捕获 (DC) 速率。对于强自电离水平，估计准确度优于 20%。我们通过 3d{sup 9}4lnl{sup '} (n=4,5) 的双电子复合 (DR) 过程的结果与文献中报告的通过详细的逐级计算获得的其他理论结果非常一致（在 10% 以内）。逐级结果转化为逐配置自电离和直流速率（估计准确度优于30%），并通过解析公式检查碰撞辐射（CR）模型中速率系数的有效性。详细计算的速率与解析公式预测的速率之间存在较大差异。由解析公式预测的自电离和直流速率可能比详细计算的速率大两个数量级以上，特别是对于能量接近电离势（IP）的自电离构型。然而，对于那些能量远高于IP的自电离构型，解析公式预测的自电离和DC速率可能小近一个数量级。这项工作中发现的不同理论方法之间的更多差异，当使用近似方法来计算自电离和直流速率时，当非局部热力学平衡（NLTE）模型使用不太准确的方法来获取这些原子数据时，会导致差异。 “ 较少的
Large-scale level-by-level calculations were carried out to obtain as accurate autoionization and dielectronic capture (DC) rates of Ni-like Au{sup 51+} and Cu-like Au{sup 50+} as possible by including adequate electron correlations. The accuracy is estimated to be better than 20% for strong autoionized levels. Our results of the dielectronic recombination (DR) process through 3d{sup 9}4lnl{sup '} (n=4,5) agree excellently (within 10%) with other theoretical results also obtained by detailed level-by-level calculations reported in the literature. The level-by-level results were transformed to configuration-by-configuration autoionization and DC rates (which are estimated to be better than 30% in accuracy) and used to check the validity of the rate coefficients in collisonal-radiative (CR) models by using an analytical formula. Large discrepancies were found between the detailed calculated rates and those predicted by the analytical formula. The autoionization and DC rates predicted by the analytical formula can be more than two orders of magnitude larger than the detailed calculated rates, in particular for the autoionized configurations whose energy is near the ionization potential (IP). However, for those autoionized configurations whose energy is far above the IP, the autoionization and DC rates predicted by the analytical formula can be nearly one order of magnitude smaller. Differences more » between different theoretical methods found in this work, when approximate methods are used to calculate the autoionization and DC rates, would result in differences when non-local-thermodynamic-equilibrium (NLTE) models used the less accurate methods to obtain these atomic data. « less
登录
查看更多内容
DOI：
10.1063/1.2915135
发表时间：
1981-09
期刊：
--
影响因子：
--
作者：
R. Cowan;Yong-ki Kim
通讯作者：
R. Cowan;Yong-ki Kim
影响因子：
1.6
作者：
J. Bauche;C. Bauche-Arnoult;O. Peyrusse
通讯作者：
J. Bauche;C. Bauche-Arnoult;O. Peyrusse
DOI：
10.1088/0031-9112/33/7/033
发表时间：
1982-07
期刊：
Physics Bulletin
影响因子：
--
作者：
P. Collins
通讯作者：
P. Collins
DOI：
10.1017/cbo9780511524578.014
发表时间：
1997-10
期刊：
--
影响因子：
--
作者：
H. Griem
通讯作者：
H. Griem