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arXiv 1902.07052physics.plasm-ph
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等离子体中自由电子简并度对碰撞率的影响

Impact of free electron degeneracy on collisional rates in plasmas

Gareth O. Williams, H. -K. Chung, S. Künzel, V. Hilbert, U. Zastrau, H. Scott, S. Daboussi, B. Iwan, A. I. Gonzalez, W. Boutu, H. J. Lee, B. Nagler, E. Granados… 展开作者

Gareth O. Williams, H. -K. Chung, S. Künzel, V. Hilbert, U. Zastrau, H. Scott, S. Daboussi, B. Iwan, A. I. Gonzalez, W. Boutu, H. J. Lee, B. Nagler, E. Granados, E. Galtier, P. Heimann, B. Barbrel, R. W. Lee, B. I. Cho, P. Renaudin, H. Merdji, Ph. Zeitoun, M. Fajardo

摘要:

简并等离子体中的量子效应决定了自由电子的行为,在地球和整个太空中无处不在。束缚态和自由电子态之间的跃迁决定了等离子体的基本性质,然而简并度对这些跃迁的影响只是理论上的。在这里,我们使用X射线自由电子激光来创建和表征简并等离子体。我们观察到的核心电子荧光光谱,不能复制的模型,忽略了自由电子简并。我们表明,简并的行为,以限制可用的电子能量状态,从而减缓过渡到和从连续的速率。我们耦合简并和束缚电子动力学在一个现有的碰撞辐射代码,这与观测结果吻合得很好。的截面的形状的影响,因此,由于简并校正的幅度,也进行了讨论。这项研究表明,在等离子体中的简并可以显着影响实验观测,如发射光谱,这些影响可以包括在参数化完善的原子物理学代码。这项工作缩小了凝聚态物质和等离子体阶段之间的理解差距,这两者共存于无数的场景中。

英文摘要:

Degenerate plasmas, in which quantum effects dictate the behavior of free electrons, are ubiquitous on earth and throughout space. Transitions between bound and free electron states determine basic plasma properties, yet the effects of degeneracy on these transitions have only been theorized. Here, we use an x-ray free electron laser to create and characterize a degenerate plasma. We observe a core electron fluorescence spectrum that cannot be reproduced by models that ignore free electron degeneracy.We show that degeneracy acts to restrict the available electron energy states, thereby slowing the rate of transitions to and from the continuum. We couple degeneracy and bound electron dynamics in an existing collisional-radiative code, which agrees well with observations. The impact of the shape of the cross section, and hence the magnitude of the correction due to degeneracy, is also discussed. This study shows that degeneracy in plasmas can significantly influence experimental observables such as the emission spectra, and that these effects can be included parametrically in well-established atomic physics codes. This work narrows the gap in understanding between the condensed-matter and plasma phases, which coexist in myriad scenarios.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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