Abstract
The dissociative recombination of small cluster cations with free, zero-energy electrons was studied at the ASTRID storage ring. It was found that only two-body fragmentation channels contribute: C+C{sub 2} for C{sub 3}{sup +}, C{sub 2}+C{sub 2} and C+C{sub 3} for C{sub 4}{sup +}. For C{sub 5}{sup +} and C{sub 6}{sup +} the final channels were also characterized by two-body fragmentation, but the specific channels were not identified because of limited mass resolution. It is being speculated whether cluster ions larger than C{sub 6}{sup +} may undergo recombination without dissociation. These clusters have a large heat capacity and a correspondingly lower temperature after electron capture. The decay of the intermediate neutral clusters may be influenced by infrared emission, which provides cooling and prevents dissociation.
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