Two new operation modes, “pink beam” excitation, which has the energy bandwidth defined by X-ray mirrors and filters, and “broadband beam”, where the energy bandwidth is defined by the reflection from a multilayer monochromator, were implemented at the SuperXAS beamline of the Swiss Light Source (SLS). These setups allow measuring non-resonance X-ray emission spectra (XES) with 2–3 orders of magnitude higher incident flux than non-resonant XES measurements with a monochromatic incident beam. For the broadband beam mode, a Mo/Si multilayer structure was designed, with which the energy can be tuned in the 5–17 keV range. The multilayer demonstrates a relatively large energy bandwidth of 4 ± 0.2% through the whole energy range and a reflectivity of 23–60%, which increases with energy. We show that by using pink beam mode one can investigate the electronic structure of photocatalytic intermediates through time-resolved core-to-core XES experiments of diluted samples with a concentration of the element of interest of ~1 mM. Broadband beam mode is optimal for valence-to-core XES experiments and allow to avoid the excitation of additional KLβ satellites that can complicate the interpretation of spectra.

在SuperXAS上实现了两种新的操作模式：“粉红色束”激发（具有由X射线镜和滤镜定义的能量带宽）和“宽带束”（其中能量带宽由多层单色仪的反射定义）瑞士光源（SLS）的光束线。与使用单色入射光束的非共振XES测量相比，这些设置允许测量非共振X射线发射光谱（XES）的入射通量要高2-3个数量级。对于宽带束模式，设计了Mo / Si多层结构，利用该结构可以在5-17 keV范围内调节能量。多层膜在整个能量范围内显示出相对较大的能量带宽，为4±0.2％，反射率则为23-60％，随能量的增加而增加。我们表明，通过使用粉红色束模式，可以通过时间分辨的核对核XES实验（浓度约为1 mM的稀释元素）研究光催化中间体的电子结构。宽带波束模式对于价核心XES实验是最佳的，并且可以避免激发额外的KLβ卫星，而这可能会使频谱的解释复杂化。