The BRIMSTONE is a powerful, desktop-sized x-ray emission spectrometer. X-ray emission spectroscopy (XES) is essentially the same measurement as x-ray fluorescence (XRF) but with very high energy resolution (<1 eV), which allows access to a wealth of additional information about the systems being measured. 

Prime examples are analyzing the oxidation state sensitivity of the Kα & Kβ XES line of P, S, and Cl allowing direct probing of the valence electronic structure, with strong sensitivity to e.g. the presence of oxygen ligands. 

The instrument is optimized for the tender x-ray range (~2-5 keV). In addition to P and S, this energy range includes the L emission lines of 5th row transition metals as well as the M emission lines of actinides. 

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