A von Hamos spectrometer for in situ sulfur speciation by non-resonant sulfur Kα emission spectroscopy. Issue 10 (28th August 2019) - Kuzmenko, Dzulija
Abstract : A von Hamos geometry based wavelength dispersive spectrometer combined with an in situ reactor cell has been developed to measure non-resonant sulfur Kα emission for the in situ speciation of low concentrations of sulfur. Abstract : A von Hamos geometry based wavelength dispersive spectrometer combined with an in situ reactor cell has been developed to measure non-resonant sulfur Kα emission for the in situ speciation of low concentrations of sulfur. The spectrometer operates at 15 cm focusing radius, is equipped with a curved Si(111) crystal and a position sensitive detector, and is capable of achieving an energy resolution of 0.56 eV at 2.3 keV. We present the details of the spectrometer and dedicated sample-cell design to study chemical reactions in situ . The spectrometer capabilities are exemplified by an in situ study of sulfur speciation during H2 S poisoning of SiO2 supported Ru nanoparticles performing CO methanation.