包含强 3.2 $\mu$m 发射线的 Ca IV 碰撞激发与光激发研究
Collisional- and photo-excitations of Ca IV including strong 3.2 $μ$m emission line
AI总结：
首次利用相对论 Breit-Pauli R-Matrix 方法研究 Ca IV 电子碰撞激发特性，预测了强 3.2 $\mu$m 红外发射线，并提供了 54 个能级间 1431 次激发的碰撞强度与有效碰撞强度数据。
摘要：
我们首次使用相对论 Breit-Pauli R-Matrix 方法，对 Ca IV 的电子碰撞激发（EIE）特性进行了详细研究，该方法采用了包含属于 n=2,3,4 复合体的 54 个精细结构能级的大型密耦合波函数展开。我们的研究预测在红外（IR）波段存在一条强 3.2 $\mu$m 发射线。EIE 碰撞强度（$\Omega$）表现出广泛的共振现象，且背景增强，导致在约 10,000 K 时有效碰撞强度（$\gamma$）为 2.2，并在约 300,000 K 时增加到 9.66。本研究结果包括 54 个能级之间所有 1431 次激发的碰撞强度，以及有限数量可能感兴趣的跃迁的有效碰撞强度。我们发现在低能区存在广泛的共振现象，以及共振和 54 能级波函数的分波收敛。在较高能量下，禁戒跃迁的碰撞强度在共振区之外减小，对于具有低振子强度的偶极允许跃迁则几乎恒定或缓慢下降，而对于具有高 f 值的跃迁，则随 ln(E) 的 Bethe-Coulomb 行为上升至近乎平台。
英文摘要：
We report a detailed study of features of electron-impact excitation (EIE) of Ca IV for the first time using the relativistic Breit-Pauli R-Matrix method with a large close coupling wavefunction expansion of 54 fine structure levels belonging to n=2,3,4 complexes. Our study predicts presence of a strong 3.2 $μ$m emission line in IR. The EIE collision strength ($Ω$) shows extensive resonances with enhanced background resulting in an effective collision strength ($γ$) of 2.2 at about 10,000 K that increases to 9.66 around 300,000 K. The present results include collision strength of all 1431 excitations among the 54 levels and effective collision strength for a limited number of transitions of possible interest. We have found extensive resonances in the low energy region, convergence of the resonances, and of the partial waves with the 54 levels wavefunction. At higher energy, the collision strength decreases beyond the resonance region for forbidden transitions, is almost constant or decreases slowly for dipole-allowed transitions with low oscillator strengths, and rises with Bethe-Coulomb behavior of ln(E)to almost a plateau for transitions with high f-values.
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