2020同步年報

104 ACTIVITY REPORT 2020 Fig. 8 : (above) Optical layout of the TPS 35A beamline. (left) Schematic view of endstation TPS 35A . Fig. 9 : (above) TPS 38A optical layout. (below) Schematic view of XAS and XES endstations. XES endstation XAS endstation 4.5−34 keV for XAS experiments and serve a wide range of users. The beamline will consist of several optical devices including a three-reflective -stripe (Si, Rh, Pt) collimating mirror (CM), a Si(111) channel-cut quick- scanning monochromator (Q-Mono), a bilayer-coated (12.5 nm Al 2 O 3 /50 nm Pt) toroidal focusing mirror (TFM) and a two-stripe (Si, Rh) HHRM. With grazing angle 4.5 mrad of HHRM, the high harmonic ratio 1 × 10 -4 can be achieved with flux greater than 2 × 10 11 photons/s at 10 keV. Under opti- mized conditions, the calculated spot size is 56 × 64 µm 2 (H × V) full width at half maximum (FWHM) at the focus position. The main techniques at TPS 38A are conventional transmission and uorescence XAS, high-energy resolution fluorescence detected XAS, and X-ray emission spectroscopy (XES). The rapid-scanning capability of the monochromator will allow time-resolved measurements of chemical reactions and structural transformations under conditions in-situ and operando . The XAS experimental station will consist of several grid-ion chambers, slits, optical choppers, high-precision motorized stages and a multi-sensor SDD to perform time-resolved XAS measurements in transmission and uorescence modes. The XES experimental station will consist of a wavelength-dispersive spectrometer based on a Von Hamos geometry and a 2-dimensional area detector for time- resolved studies. We plan also to offer the capability of powder diffraction using a 2-dimensional area detector and a Raman spectrometer. Those techniques can be used in combination or separately to measure various characteristics of the same sample. Various reaction cells and micro-reactors, combined with XAS/XRD and XAS/Raman will be developed for specific purposes. Applications are consequently expected to cover a broad span of various disciplines from materials, chemistry,