论文标题
用于建模天体物理电荷交换等离子体的原子数据中的不确定性
Uncertainties in Atomic Data for Modeling Astrophysical Charge Exchange Plasmas
论文作者
论文摘要
关于理论原子数据的相关不确定性对于确定包括天体物理研究在内的许多领域的血浆诊断的准确性至关重要。我们基于与在历史融合的梁，冷目标后接线离子动量光谱谱和电子束离子陷阱实验中获得的一系列比较，对当前理论离子障碍物交换原子数据和X射线光谱进行了新的计算计算。发现平均系统不确定性的总横截面为35-88％，特征线比率为57-75％。模型偏差随着碰撞能量的减少而增加。总横截面上的误差进一步引起了低温碰撞等离子体电离平衡计算的显着不确定性。需要对原子数据库和专用实验室测量的实质性改进，以便从下一个X射线光谱任务中为当前的X射线光谱做好准备。
Relevant uncertainties on theoretical atomic data are vital to determine the accuracy of plasma diagnostics in a number of areas including in particular the astrophysical study. We present a new calculation of the uncertainties on the present theoretical ion-impact charge exchange atomic data and X-ray spectra based on a set of comparisons with the existing laboratory data obtained in historical merged-beam, cold-target recoil-ion momentum spectroscopy, and electron beam ion traps experiments. The average systematic uncertainties are found to be 35-88% on the total cross sections, and 57-75% on the characteristic line ratios. The model deviation increases as the collision energy decreases. The errors on total cross sections further induce a significant uncertainty to the calculation of ionization balance for low temperature collisional plasmas. Substantial improvements of the atomic database and dedicated laboratory measurements are needed to get the current models ready for the X-ray spectra from the next X-ray spectroscopic mission.
