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Open Access Publications from the University of California

Role of a Neighbor Ion in the Fragmentation Dynamics of Covalent Molecules.

  • Author(s): Méry, A
  • Agnihotri, AN
  • Douady, J
  • Fléchard, X
  • Gervais, B
  • Guillous, S
  • Iskandar, W
  • Jacquet, E
  • Matsumoto, J
  • Rangama, J
  • Ropars, F
  • Safvan, CP
  • Shiromaru, H
  • Zanuttini, D
  • Cassimi, A
  • et al.

Fragmentation of molecular nitrogen dimers (N_{2})_{2} induced by collision with low energy 90 keV Ar^{9+} ions is studied to evidence the influence of a molecular environment on the fragmentation dynamics of N_{2} cations. Following the capture of three or four electrons from the dimer, the three-body N_{2}^{+}+N^{m+}+N^{n+} [with (m,n)=(1,1) or (1, 2)] fragmentation channels provide clean experimental cases where molecular fragmentation may occur in the presence of a neighbor molecular cation. The effect of the environment on the fragmentation dynamics within the dimer is investigated through the comparison of the kinetic energy release (KER) spectra for these three-body channels and for isolated N_{2}^{(m+n)+} monomer cations. The corresponding KER spectra exhibit energy shifts of the order of 10 eV, attributed to the deformation of the N^{m+}+N^{n+} potential energy curves in the presence of the neighboring N_{2}^{+} cation. The KER structures remain unchanged, indicating that the primary collision process is not significantly affected by the presence of a neighbor molecule.

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