Competition between decay and dissociation of core-excited OCS studied by X-ray scattering

We show the first evidence of dissociation during resonant inelastic soft X-ray scattering. Carbon and oxygen K-shell and sulfur L-shell resonant and non-resonant X-ray emission spectra were measured using monochromatic synchrotron radiation for excitation and ionization. After sulfur, L2,3 -> {\pi}*, {\sigma}* excitation, atomic lines are observed in the emission spectra as a consequence of competition between de-excitation and dissociation. In contrast the carbon and oxygen spectra show weaker line shape variations and no atomic lines. The spectra are compared to results from ab initio calculations and the discussion of the dissociation paths is based on calculated potential energy surfaces and atomic transition energies.Comment: 12 pages, 6 pictures, 2 tables, http://link.aps.org/doi/10.1103/PhysRevA.59.428

Structural Characterization of Intercalated C2Fx Compounds Using XAFS Polarization Dependencies

Orientation dependencies of FeK, BrK EXAFS and XANES spectra have been measured for intercalated compounds of the composition C2Fx*yA (X≈1, A=Br2, BrF3, Fe(AA)3, FeCl3) synthesized by diffusion from solutions. An approach has been developed which allows determination of the ranges of the orientation angles of T-shaped BrF3 molecules from XANES spectra. The values of the orientation angles of BrF3 molecules were determined by simultaneously analyzing EXAFS and XANES data. It was found that heating leads to the formation in the intercalated compound of lens-like regions containing oriented BrF3 molecules. The orientation and geometry of Br2 molecules in the studied compounds were shown to be substantially different from those in graphite intercalation compounds. The intercalation was shown to lead to deformation of the Fe(AA)3 molecule while the FeCl3 molecules form dimers