Interaction of photons with plasmas and liquid metals-photoabsorption and scattering
Interaction of photons with plasmas and liquid metals-photoabsorption and scattering
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DOI：
10.1088/0953-8984/12/3/303
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发表时间：
2000-01-24
影响因子：
2.7
通讯作者：
Chihara, J
中科院分区：
文献类型：
--
作者：
Chihara, J
以统一的方式推导了描述等离子体或液态金属的光吸收和光子散射的公式。展示了系统中每个离子的核运动、自由电子运动和核心电子行为如何决定电子-离子混合物中光吸收和散射的结构。偶极子近似中的吸收截面由三项组成，分别表示由核运动引起的吸收、由于产生光导率或逆轫致辐射的自由电子运动引起的吸收以及通过多普勒校正归因于每个离子的核心电子行为的吸收。此外，光子散射公式为观察离子-离子动态结构因子（DSF）、产生等离子体振荡的电子-电子DSF和产生X射线拉曼（康普顿）散射的核心-电子DSF的实验提供了一种分析方法，并以统一的方式明确定义了每个实验的背景散射。还导出了液态金属的反常 X 射线散射公式。同时从这个一般的角度讨论等离子体物理学中的汤姆逊散射。
Formulae for describing the photoabsorption and the photon scattering by a plasma or a liquid metal are derived in a unified manner. It is shown how the nuclear motion, the free-electron motion and the core-electron behaviour of each ion in the system determine the structure of the photoabsorption and scattering in an electron-ion mixture. The absorption cross section in the dipole approximation consists of three terms which represent the absorption caused by the nuclear motion, the absorption owing to the free-electron motion producing optical conductivity or inverse Bremsstrahlung and the absorption ascribed to the core-electron behaviour of each ion with the Doppler correction. Also, the photon scattering formula provides an analysis method for experiments observing the ion-ion dynamical structure factor (DSF), the electron-electron DSF giving plasma oscillations and the core-electron DSF yielding the x-ray Raman (Compton) scattering with a clear definition of the background scattering for each experiment, in a unified manner. A formula for anomalous x-ray scattering is also derived for a liquid metal. At the same time, Thomson scattering in plasma physics is discussed from this general point of view.