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    • Electron impact ionization of thymine clusters embedded in superfluid helium dropletsPeer reviewedClosed access 

      2007, LECOINTRE, Julien; Zappa, F.; Denifl, S.; Mähr, I.; Rondino, F.; Echt, O.; Märk, T.D.; Scheier, P., HENALLUX
      Article scientifique
      Embedding molecules in helium clusters has become a powerful technique for the preparation of cold targets for spectroscopy experiments, as well as for the assembly of complex, fragile molecular species. We have recently developed a helium cluster source and a pick-up cell to produce neutral beams of doped helium droplets, to be used as targets in studies on electron collisions with molecules of ...

    • Mass Spectrometric Investigation of Anions Formed upon Free Electron Attachment to Nucleobase Molecules and Clusters Embedded in Superfluid Helium DropletsPeer reviewedClosed access 

      2006, LECOINTRE, Julien; Denifl, S.; Zappa, F.; Mähr, I.; Probst, M.; Märk, T. D.; Scheier, P., HENALLUX
      Article scientifique
      Here we report the first mass spectrometric study of negative ions formed via free electron attachment (EA) to nucleobases (NBs) embedded in helium clusters. Pure and mixed clusters of adenine and thymine have been formed by pickup of isolated NB molecules by cold helium droplets. In contrast to EA of isolated molecules in the gas phase we observe a long-lived parent anion NB− and, in addition, ...