阈下激发金属的X射线荧光光谱
X-ray fluorescence spectra of metals excited below threshold
摘要：
用单色同步辐射测量了Cu和Ni金属的X射线散射谱。散射过程中的能量守恒被认为是足以解释调制的光谱形状，忽略动量守恒和信道干扰。在接近和高于阈值的激发能处，发射光谱映射了被占据的局部态密度。对于亚阈值激发，非弹性散射的高能侧翼表现出拉曼型线性色散，和不对称的低能尾部的发展。对于远低于阈值的激发，发射光谱与占据的和未占据的局部态密度的卷积成比例。
英文摘要：
X-ray scattering spectra of Cu and Ni metals have been measured using monochromatic synchrotron radiation tuned from far above to more than 10 eV below threshold. Energy conservation in the scattering process is found to be sufficient to explain the modulation of the spectral shape, neglecting momentum conservation and channel interference. At excitation energies close to and above threshold, the emission spectra map the occupied local partial density of states. For the sub-threshold excitations, the high-energy flank of the inelastic scattering exhibits a Raman-type linear dispersion, and an asymmetric low energy tail develops. For excitation far below threshold the emission spectra are proportional to a convolution of the occupied and unoccuppied local partial densities of states.
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