论文标题
来自氢原子的瑞利散射，包括共振和高光子能量
Rayleigh scattering from hydrogen atoms including resonances and high photon energies
论文作者
论文摘要
在较广泛的光子能量（$ <0.8 $ keV）的情况下计算了基氢原子雷利原子散射的非相关横截面。评估是根据原子极化性的实际和虚构组成部分进行的。使用精确的分析表达式对结合和连续态的振荡器强度进行精确的分析表达式进行了表征该二阶辐射过程的中间状态的总和。与激发状态的有限寿命相关的阻尼术语，并将其分为两个细胞结构级别（$ p_ {1/2} $和$ p_ {3/2} $）在共鸣横截面中考虑在内。对入射光子能量i）提出了横截面评估所需的拟合公式i）第一个共振的红向（lyman- $α__{1/2} $），ii），ii），在与电离阈值之上的谐振区域相对应的频谱区域（其中的任意数量）和III。
The non-relativistic cross section from Rayleigh scattering by hydrogen atoms in the ground state is calculated over a wide range of photon energies ($< 0.8$ keV). Evaluations are performed in terms of the real and imaginary components of the atomic polarizability. The sum over intermediate states that characterizes this second-order radiative process is performed using exact analytic expressions for oscillator strengths of bound and continuum states. Damping terms associated with the finite lifetimes of excited states and their splitting into two fine-structure levels ($p_{1/2}$ and $p_{3/2}$) are taken into account in resonance cross sections. Fitting formulas required for cross-section evaluation are presented for incident photon energy i) redward of the first resonance (Lyman-$α_{1/2}$), ii) in the spectral region corresponding to resonances (for an arbitrary number of them), and iii) above the ionization threshold.
