论文标题
来自非线性谐振X射线吸收光谱的镍的高能密度的电子动力学
Electron Dynamics at High-Energy Densities in Nickel from Non-linear Resonant X-ray Absorption Spectra
论文作者
论文摘要
X射线自由电子激光器（FELS）的脉冲强度可以在固体中产生极端的激发密度，从而进入非线性X射线 - 射线相互作用的状态。我们显示了带有流体的金属镍薄膜的L3边缘吸收光谱，该薄膜进入了一个机制，其中每个吸收横截面都入射了几个X射线光子。使用状态的固定密度和成列的地基质特性，用观测到的非线性光谱变化的主要特征用电子种群动力学的预测速率模型来描述。
The pulse intensity from X-ray free-electron lasers (FELs) can create extreme excitation densities in solids, entering the regime of non-linear X-ray-matter interactions. We show L3-edge absorption spectra of metallic nickel thin films with fluences entering a regime where several X-ray photons are incident per absorption cross-section. Main features of the observed non-linear spectral changes are described with a predictive rate model for electron population dynamics during the pulse, utilizing a fixed density of states and tabulated ground-state properties.
