Ne（8，9）+与He和H2碰撞中n分辨态选择电荷交换的测量
Measurement of n-resolved State-Selective Charge Exchange in Ne(8,9)+ Collision with He and H2
摘要：
高电荷态离子与中性原子和分子之间的电荷交换被认为是控制天体和环境中软X射线发射的重要机制之一。然而，在模拟电荷交换软X射线辐射时，n和l分辨态选择俘获截面数据通常是通过经验和半经典理论计算获得的。利用新研制的冷靶反冲离子动量谱（COLTRIMS）装置，在1 ~ 24.75keV/u的碰撞能量范围内，对Ne（8，9）+离子与He和H_2的电荷交换进行了一系列测量。报道了n分辨态选择性俘获截面。通过比较多通道Landau Zener方法（MCLZ）和态选择俘获截面的测量结果，发现MCLZ方法计算的氦靶态选择俘获截面与测量结果符合得很好。此外，利用MCLZ计算的nl分辨截面，并将天体物理文献中常用的l分布应用于实验得到的n分辨截面，计算了4keV/uNe ~（8+）与He之间电荷交换的软X射线辐射，并考虑了激发态Ne ~（7+）离子的辐射级联.合理的协议，发现在比较均匀和可分离的模型的测量，和MCLZ计算给出了更好的协议的结果。
英文摘要：
Charge exchange between highly charged ions and neutral atoms and molecules has been considered as one of the important mechanisms controlling soft X ray emissions in many astrophysical objects and environments. However, for modeling charge exchange soft X ray emission, the data of n and l resolved state selective capture cross sections are often obtained by empirical and semiclassical theory calculations. With a newly built cold target recoil ion momentum spectroscopy (COLTRIMS) apparatus, we perform a series of measurements of the charge exchange of Ne(8,9)+ ions with He and H2 for collision energy ranging from 1 to 24.75 keV/u. n resolved state selective capture cross-sections are reported. By comparing the measured state selective capture cross sections to those calculated by the multichannel Landau Zener method (MCLZ), it is found that MCLZ calculations are in good agreement with the measurement for the dominant n capture for He target. Furthermore, by using nl resolved cross sections calculated by MCLZ and applying l distributions commonly used in the astrophysical literature to experimentally derived n resolved cross sections, we calculate the soft X ray emissions in the charge exchange between 4 keV/u Ne8+ and He by considering the radiative cascade from the excited Ne7+ ions. Reasonable agreement is found in comparison to the measurement for even and separable models, and MCLZ calculations give results in a better agreement.
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