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    Université de Fribourg

    Recent research directions in Fribourg: nuclear dynamics in resonances revealed by 2-dimensional EEL spectra, electron collisions with ionic liquids and electronic excitation of pyrimidine

    Allan, Michael ; Regeta, Khrystyna ; Gorfinkiel, Jimena D. ; Mašín, Zdeněk ; Grimme, Stefan ; Bannwarth, Christoph

    In: The European Physical Journal D, 2016, vol. 70, no. 5, p. 1–7

    The article briefly reviews three subjects recently investigated in Fribourg: (i) electron collisions with surfaces of ionic liquids, (ii) two-dimensional (2D) electron energy loss spectra and (iii) resonances in absolute cross sections for electronic excitation of unsaturated compounds. Electron energy loss spectra of four ionic liquids revealed a number of excited states, including triplet...

    Université de Fribourg

    Resonance effects in elastic cross sections for electron scattering on pyrimidine: Experiment and theory

    Regeta, Khrystyna ; Allan, Michael ; Winstead, Carl ; McKoy, Vincent ; Mašín, Zdeněk ; Gorfinkiel, Jimena D.

    In: The Journal of Chemical Physics, 2016, vol. 144, no. 2, p. 024301

    We measured differential cross sections for elastic (rotationally integrated) electron scattering on pyrimidine, both as a function of angle up to 180∘ at electron energies of 1, 5, 10, and 20 eV and as a function of electron energy in the range 0.1–14 eV. The experimental results are compared to the results of the fixed-nuclei Schwinger variational and R-matrix theoretical methods, which...

    Université de Fribourg

    Absolute cross sections for electronic excitation of pyrimidine by electron impact

    Regeta, Khrystyna ; Allan, Michael ; Mašín, Zdeněk ; Gorfinkiel, Jimena D.

    In: The Journal of Chemical Physics, 2016, vol. 144, no. 2, p. 024302

    We measured differential cross sections for electron-impact electronic excitation of pyrimidine, both as a function of electron energy up to 18 eV, and of scattering angle up to 180°. The emphasis of the present work is on recording detailed excitation functions revealing resonances in the excitation process. The differential cross sections were summed to obtain integral cross sections. These...