Experimental measurements of the collisional absorption of XUV radiation in warm dense aluminium.
Experimental measurements of the collisional absorption of XUV radiation in warm dense aluminium.
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暖致密铝中 XUV 辐射碰撞吸收的实验测量。
DOI：
10.1103/physreve.94.023203
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Kettle B
中科院分区：
文献类型：
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作者：
Kettle B
热致密铝对软X射线的碰撞(或无自由)吸收仍然是一个悬而未决的问题。对这一过程存在相互矛盾的描述，我们将其中两种描述与我们这里的实验数据进行比较。其中一种是基于弱散射模型，另一种是使用修正的经典方法。这两个模型随温度的变化表现出明显不同的行为。在这里，我们描述了26 eV光子在固体密度温铝(EV)中吸收的实验证据。来自涂有钯的CH箔的辐射X射线加热被用来产生温暖致密的铝样品，来自Ar气体喷射的激光驱动的高次谐波光束提供了探头。结果表明，加热后吸光度变化很小或没有变化。这一行为与修正的经典方法的预测是一致的，尽管在绝对吸收值上不是一致的。验证正确的吸收机制对于更好地理解热致密状态的复杂行为具有决定性意义。
The collisional (or free-free) absorption of soft x rays in warm dense aluminium remains an unsolved problem. Competing descriptions of the process exist, two of which we compare to our experimental data here. One of these is based on a weak scattering model, another uses a corrected classical approach. These two models show distinctly different behaviors with temperature. Here we describe experimental evidence for the absorption of 26-eV photons in solid density warm aluminium (eV). Radiative x-ray heating from palladium-coated CH foils was used to create the warm dense aluminium samples and a laser-driven high-harmonic beam from an argon gas jet provided the probe. The results indicate little or no change in absorption upon heating. This behavior is in agreement with the prediction of the corrected classical approach, although there is not agreement in absolute absorption value. Verifying the correct absorption mechanism is decisive in providing a better understanding of the complex behavior of the warm dense state.