Prediction and observation of tin and silver plasmas with index of refraction greater than one in the soft x-ray range.
Prediction and observation of tin and silver plasmas with index of refraction greater than one in the soft x-ray range.
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软X射线范围内折射率大于1的锡和银等离子体的预测和观测。
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
W. Johnson
中科院分区：
文献类型：
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作者：
J. Filevich;J. Grava;M. Purvis;M. Marconi;J. Rocca;J. Nilsen;J. Dunn;W. Johnson
我们提出的计算预测和实验确认，双电离银和锡等离子体可以有一个折射率大于1的软X射线波长。使用毛细管放电软X射线激光器在波长下进行的干涉测量实验证实，在几次电离的激光产生的这些元素的等离子体中，束缚电子的异常色散可以支配自由电子的贡献，使折射率大于1。结果证实，束缚电子可以强烈影响折射率的许多等离子体在广泛的软x射线波长证实了最近的观察。在未来十年中，随着x射线自由电子激光器将可用于探测更高密度和更短波长的更广泛的等离子体，对短波长折射率的理解将变得更加重要。
We present the calculated prediction and the experimental confirmation that doubly ionized Ag and Sn plasmas can have an index of refraction greater than one for soft x-ray wavelengths. Interferometry experiments conducted using a capillary discharge soft x-ray laser operating at a wavelength of confirm that in few times ionized laser-created plasmas of these elements the anomalous dispersion from bound electrons can dominate the free electron contribution, making the index of refraction greater than one. The results confirm that bound electrons can strongly influence the index of refraction of numerous plasmas over a broad range of soft x-ray wavelengths confirming recent observations. The understanding of index of refraction at short wavelengths will become even more essential during the next decade as x-ray free electron lasers will become available to probe a wider variety of plasmas at higher densities and shorter wavelengths.