Effective collision strengths for electron-impact excitation of singly ionized sulfur
Effective collision strengths for electron-impact excitation of singly ionized sulfur
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单电离硫的电子碰撞激发的有效碰撞强度
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
R. Stafford
中科院分区：
文献类型：
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作者：
C. Ramsbottom;K. L. Bell;R. Stafford
用多通道R矩阵方法计算了P序列离子S Ⅱ的电子碰撞激发的有效碰撞强度。包括在总波函数的展开中的是S II的最低的18个LS目标本征态，包括具有配置3s{sup 2} 3 p {sup 3}、3s 3 p {sup 4}和3s{sup 2} 3 p {sup 2}3d的12个n = 3能级和具有配置3s{sup 2} 3 p {sup 2}4l（l = s，p）的6个n = 4能级。这18个离子态对应于43个精细结构能级，导致总共可能的903个独立跃迁（包括所有禁止的和允许的）。通过平均麦克斯韦速度分布上的电子碰撞强度获得的有效碰撞强度对于所有精细结构跃迁被制成表格，包括n = 3能级之间的跃迁、从n = 3到n = 4态的跃迁以及n = 4能级之间的跃迁，对于电子温度T，在log T（K）= 3.5到log T（K）= 5.0的范围内。目前的结果进行了比较，与其他各种紧密耦合的数据和一些显着的差异被发现发生。特别地，我们发现，共振收敛到高的3s{sup 2} 3 p {sup 2}nlmore>>能级增强了在低冲击能量下的许多禁戒跃迁的有效碰撞强度。参考文献25篇，图2，5片。«少
The multichannel R-matrix method has been used to compute effective collision strengths for electron impact excitation of the P-sequence ion S II. Included in the expansion of the total wave function are the lowest 18 LS target eigenstates of S II, consisting of twelve n = 3 levels with configurations 3s{sup 2}3p{sup 3}, 3s3p{sup 4}, and 3s{sup 2}3p{sup 2}3d, and six n = 4 levels with configurations 3s{sup 2}3p{sup 2}4l (l = s, p). These 18 ionic states correspond to 43 fine-structure levels, leading to a total possible 903 independent transitions (including all forbidden, and allowed). The effective collision strengths which are obtained by averaging the electron collision strengths over a Maxwellian distribution of velocities are tabulated for all fine-structure transitions to include those between the n = 3 levels, those from the n = 3 to n = 4 states, and those between the n = 4 levels, for electron temperatures, T, in the range log T (K) = 3.5 to log T(K) = 5.0. The present results are compared with a variety of other close-coupling data and some significant differences are found to occur. In particular we find that resonances converging to the high lying 3s{sup 2}3p{sup 2}nlmore » levels enhance the effective collision strength for many of the forbidden transitions at low impact energies. 25 refs., 2 figs., 5 tabs.« less