Abstract
The dynamics of the fragmentation process following the recombination with low energetic free electrons was studied for H 3 + and D 3 + using a two-dimensional imaging technique. The kinematical correlation of the atomic fragments in the three-body fragmentation channel, as well as the vibrational excitation distribution of the molecular fragments in the two-body channel, could be determined. In addition, a considerable rotational excitation of the H 3 + and D 3 + ions circulating in the storage ring TSR was observed even after storage time of more than 1 min. In contrast, the heteronuclear D 2H + isotopomer possessing an electric dipole moment does not exhibit any internal excitations after 10 s of storage.
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