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    Université de Fribourg

    Long-lived transient anion of c-C₄F₈O

    Kočišek, J. ; Janečková, Radmila ; Fedor, Juraj

    In: The Journal of Chemical Physics, 2018, vol. 148, no. 7, p. 074303

    We report partial cross sections for electron attachment to c-C4F8O, a gas with promising technological applications in free-electron-rich environments. The dissociative electron attachment leads to a number of anionic fragments resulting from complex bond-breaking and bond-forming processes. However, the anion with the highest abundance is the non-dissociated (transient) parent anion which...

    Université de Fribourg

    Experimental evidence on the mechanism of dissociative electron attachment to formic acid

    Janečková, Radmila ; Kubala, Dušan ; May, Olivier ; Fedor, Juraj ; Allan, Michael

    In: Physical Review Letters, 2013, vol. 111, no. 21, p. 213201

    Two mechanisms for dissociative electron attachment in HCOOH, the formation of HCOO−+H, were proposed in the literature: (i) via a direct electron attachment into a σ∗ resonance, augmented by dipole binding of the incident electron [G. A. Gallup et al., Phys. Rev. A 79, 042701 (2009)], and (ii) with the 1.8 eV π∗ resonance as a doorway state, linked to the products by...

    Université de Fribourg

    Dissociative electron attachment to methylacetylene and dimethylacetylene: Symmetry versus proximity

    Janečková, Radmila ; May, Olivier ; Fedor, Juraj

    In: Physical Review A - Atomic, Molecular, and Optical Physics, 2012, vol. 86, no. 05, p. 052702

    We have measured absolute dissociative electron attachment (DEA) cross sections in methylacetylene (propyne, C₃H₄) and dimethylacetylene (but-2-yne, C₄H₆). The main feature in the low-energy DEA spectrum is a π* shape resonance giving rise to fragments at 3.4 eV in C₃H₄ and 4.0 eV in C₄H₆. The process C₃H₄+e→ C₃H₃ −+H proceeds via abstraction...