Charge-Exchange Spectra of Hydrogenic and He-like Iron
Charge-Exchange Spectra of Hydrogenic and He-like Iron
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氢和类氦铁的电荷交换光谱
DOI：
10.1086/496874
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
J. Scofield
中科院分区：
文献类型：
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作者：
B. Wargelin;P. Beiersdorfer;P. Neill;R. Olson;J. Scofield
我们展示了类 H Fe XXVI 和类 He Fe XXV 电荷交换光谱，这些光谱是由高电荷铁与 N2 气体在电子束离子阱中以约 10 eV amu-1 的能量碰撞产生的。尽管在我们的测量中未解析单个高 n 发射线，但我们观察到 Fe+25 → Fe+24 电子捕获最可能的水平为 nmax ~ 9，与预期一致，而 Fe+26 → Fe+25 电荷交换最可能的值明显更高。在 Fe XXV 光谱中，Kα 发射特征占主导地位，无论是通过电荷交换还是碰撞激发产生。正如预期的那样，前一种情况的 Kα 质心能量低于后一种情况（分别为 6666 eV 和 6685 eV），因为在电荷交换光谱中，相对于共振线，禁线和复合线的发射强烈增强。相比之下，Fe XXVI 高 n 莱曼谱线的总强度大于 Lyα 的强度，并且比与原子 H 的电荷交换的理论计算预测的要强得多。我们得出的结论是，使用多电子目标气体捕获电子所产生的角动量分布与用 H 获得的角动量分布显着不同，从而导致观察到的高 n 增强。讨论了我们的结果与银心和银脊扩散铁发射研究的相关性，特别是 Astro-E2/朱雀。
We present H-like Fe XXVI and He-like Fe XXV charge-exchange spectra resulting from collisions of highly charged iron with N2 gas at an energy of ~10 eV amu-1 in an electron beam ion trap. Although individual high-n emission lines are not resolved in our measurements, we observe that the most likely level for Fe+25 → Fe+24 electron capture is nmax ~ 9, in line with expectations, while the most likely value for Fe+26 → Fe+25 charge exchange is significantly higher. In the Fe XXV spectrum, the Kα emission feature dominates, whether produced via charge exchange or collisional excitation. The Kα centroid is lower in energy for the former case than for the latter (6666 vs. 6685 eV, respectively), as expected because of the strong enhancement of emission from the forbidden and intercombination lines, relative to the resonance line, in charge-exchange spectra. In contrast, the Fe XXVI high-n Lyman lines have a summed intensity greater than that of Lyα and are substantially stronger than predicted from theoretical calculations of charge exchange with atomic H. We conclude that the angular momentum distribution resulting from electron capture using a multielectron target gas is significantly different from that obtained with H, resulting in the observed high-n enhancement. A discussion is presented of the relevance of our results to studies of diffuse Fe emission in the Galactic center and Galactic ridge, particularly with Astro-E2/Suzaku.
热电子的强烈扩散为漫射极光提供动力
DOI：
--
发表时间：
2018
期刊：
影响因子：
--
作者：
Kasahara;S.;Y. Miyoshi;S. Yokota;Y. Kasahara;S. Matsuda;A. Kumamoto;A. Matsuoka;H. U. Frey;V. Angelopoulos;S. Kurita;K. Keika;T. Hori;I. Shinohara
通讯作者：
I. Shinohara