ISSN:
1434-6079
Keywords:
79.20.Rf
;
36.40.td
;
34.10.tx
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The yield of C 60 + ions reflected from the surface of graphite is found to be a bimodal function of the energy of impact. Below 140 eV (6 km/s), the yield decreases with energy and the scattering time-of-flight peak is sharp. Above 170 eV, the yield increases, but the peak is broad and asymmetric, corresponding to delayed electron emission from an impact-heated, neutralized cluster. There is also evidence for fragmentation to C58 and C56. The emission process may be analogous to that reported for scattered C 60 − . Application of statistical rate theory to either observation (C 60 ± ) gives an estimated 25–30 percent transfer of impact energy into cluster internal modes. The decreasing yield at highest energies (〉400 eV) may result from adhesion processes (C60-surface bonding) that could also account for the absence of delayed electron emission in C60-silicon collisions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01426705
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