不完全Paschen-Back效应下超精细结构跃迁中角相关的部分频率重分布的重要性
Importance of Angle-dependent Partial Frequency Redistribution in Hyperfine Structure Transitions Under Incomplete Paschen-Back Effect Regime
摘要：
用角相关（AD）部分频率再分布（PRD）矩阵表示偏振光与原子散射中的角-频耦合。线偏振太阳光谱中存在多条谱线，PRD与超精细结构态之间的量子干涉相结合对这些谱线起着重要作用。本文给出了具有超精细结构分裂（HFS）和非偏振下能级的二能级原子散射的极化线传输方程的解。我们考虑了任意磁场（包括不完全Paschen-Back效应）和弹性碰撞的影响。为了探索的目的，我们考虑一个自发射等温平面大气，并使用原子参数，表示一个孤立的Na\，{ \sc i} D $_2$线。对于这种情况下，我们表明，AD-PRD效应是显着的场强低于约30 G，但计算要求低得多的近似角平均（AA）PRD可用于更强的领域。
英文摘要：
Angle-frequency coupling in scattering of polarized light on atoms is represented by the angle-dependent (AD) partial frequency redistribution (PRD) matrices. There are several lines in the linearly polarized solar spectrum, for which PRD combined with quantum interference between hyperfine structure states play a significant role. Here we present the solution of the polarized line transfer equation including the AD-PRD matrix for scattering on a two-level atom with hyperfine structure splitting (HFS) and an unpolarized lower level. We account for the effects of arbitrary magnetic fields (including the incomplete Paschen-Back effect regime) and elastic collisions. For exploratory purposes we consider a self-emitting isothermal planar atmosphere and use atomic parameters that represent an isolated Na\,{\sc i} D$_2$ line. For this case we show that the AD-PRD effects are significant for field strengths below about 30G, but that the computationally much less demanding approximation of angle-averaged (AA) PRD may be used for stronger fields.
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