氦扰动钾的新理论研究及其与实验室光谱的比较
New theoretical study of potassium perturbed by He and a comparison to laboratory spectra
AI总结：
该研究利用精确从头算K-He势能计算500–3000 K下的统一谱线轮廓与吸收系数表，指出Lorentzian轮廓不适用于谱线翼，为褐矮星和稠密行星大气建模提供更准确的不透明度。
摘要：
我们报告了利用从头算势能数据对氦扰动钾的统一谱线轮廓进行的新计算，计算条件对应冷的亚恒星褐矮星和炽热稠密行星大气中温度从有效温度T_eff=500 K到3000 K的普遍环境。对于这类具有H2和He大气的天体，常规实验室吸收光谱可用于检验谱线翼，并测试谱线形状理论和分子势能。我们发现，解析Lorentzian轮廓仅在距谱线中心数cm^-1的范围内有用，而在谱线翼中并不适用；在谱线翼处，辐射转移是K-He辐射碰撞的结果，而这些碰撞对相互作用势能十分敏感。共振线的K-He吸收系数表使精确的大气模型和合成光谱成为可能。为此，我们基于纳入精确从头算势能的综合谱线形状理论，提出了新的不透明度。将这些新表用于出射光谱建模，将改进以往基于不完整或不准确势能的谱线形状近似。我们还给出了针对位于0.77 μm中心的K 4s-4p共振线、在半经典和量子理论中获得的Lorentzian碰撞参数，专门用于线芯区域。
英文摘要：
We report on our new calculations of unified line profiles of K perturbed by He using ab initio potential data for the conditions prevailing in cool substellar brown dwarfs and hot dense planetary atmospheres with temperatures from $T_\mathrm{eff}$=500~$\ \mathrm{K}$ to 3000~$\ \mathrm{K}$. For such objects with atmospheres of H$_2$ and He, conventional laboratory absorption spectroscopy can be used to examine the line wings and test the line shape theories and molecular potentials. We find that an analytical Lorentzian profile is useful for a few cm$^{-1}$ from the line center, but not in the line wings, where the radiative transfer is a consequence of the K-He radiative collisions that are sensitive to the interaction potentials. Tables of the K--He absorption coefficients of the resonance lines allow accurate model atmospheres and synthetic spectra. For this purpose, we present new opacities from comprehensive line shape theory incorporating accurate ab initio potentials. Use of these new tables for the modeling of emergent spectra will be an improvement over previous line shape approximations based on incomplete or inaccurate potentials. We also present Lorentzian impact parameters obtained in the semi-classical and quantum theory for the K $4s-4p$ resonance line centered at 0.77~$μ$m specifically for the line core regime.
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