K-edge x-ray absorption spectra of Cs and Xe

Investigation of the local structure of molten ThF4–LiF and ThF4–LiF–BeF2 mixtures by high-temperature X-ray absorption spectroscopy and molecular-dynamics simulation

“…The amplitude reduction factor S 0 2 was set to 0.9 (Zhang et al, 2018). The double-electron excitations affect the EXAFS signal and can influence the result of the data analysis (Hennig, 2007;Gomilšek et al, 2003;Benfield et al, 1994;Kodre et al, 2002). Thus, in thorium L 3 -edge EXAFS experimental spectra, the double-electron excitations were subtracted as a reflection of the data translated to the position in energy of the excitation using the standard procedures in Demeter.…”

X-ray absorption in atomic potassium

“…For most other elements, however, the required density of the free-atoms is very difficult to prepare and maintain. High-temperature cells have been employed for the purpose for volatile metals [3][4][5][6][7][8][9]. The range of application of the cells depends critically on the material for the windows: it must withstand the elevated temperature, the pressure difference and the chemically aggressive vapor, at a minimum attenuation of the X-ray beam.…”

Thermodynamics of the amalgam cells {Cs-amalgam|CsX (m)|AgX|Ag} (X=Cl, Br, I) and primary medium effects in (methanol+water), (acetonitrile+water), and (1,4-dioxane+water) solvent mixtures

“…The related EXAFS spectra have been recorded in acetonitrile, which is known to be the best suitable, non-oxygenated solvent medium (in contrast to methanol and 1,4-dioxane), when studying competitive solvation of ions. In this context, figure 4 shows only a very weak EXAFS signal in the case of Cs + and I À (which is probably related to multiple excitation phenomena, as already shown in the literature [50]), which indicates poor or no solvation at all. Furthermore, passing from pure water to pure acetonitrile, we do not observe any detectable difference in the spectra, thus meaning no change in the surrounding of the ions; this is a further evidence of poor coordination ability and low medium effects for both ions.…”