Spontaneous Decay of Highly-Charged Fullerene Ions C60Z and C58z |
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Authors: | P Scheier B Dü nser Y B Kim T D M rk |
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Affiliation: | P. Scheier ,B. Dü,nser,Y. B. Kim,T. D. Mä,rk |
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Abstract: | Using isotope-resolved, two sector field mass spectrometric techniques we have identified and investigated quantitatively the energetics and kinetics (in particular the kinetic energy release, KER) of the spontaneous decay reactions C60-2mz+ → C60-2m-p(z-1)+ + Cp+ with m = 0 or 1, z ranging from 3 to 6 and p = 2 and 4. The obtained KER results are not compatible with the properties expected for a single-step fissioning reaction as described by the liquid drop model. Therefore the present data had to be interpreted by a different fragmentation mechanism. This novel reaction sequence, termed auto charge transfer (ACT) reaction, is initiated by the statistically driven neutral C2 (or C4) evaporation followed by an electron transfer process from the receding C2 (or C4) fragment to the remaining highly-charged fullerene ion thereby leading finally to the two charged reaction products observed in the exit channel of the decay reaction. Moreover, in the case that a C2+ loss from C60z+ is occurring in the first field-free region we have been able to demonstrate that it is possible to observe in the second field-free region a subsequent C2 evaporation from the C58(z-1)+ fragment ion. |
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