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Site occupancy and molecular complex formation of 19F ions in fullerenes C60 and C70 studied by TDPAD |
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| Authors: | Bossenger M.G. Connell S.H. Sideras-Haddad E. Appel H. Doyle B.P. Verwoerd W. Bharuth-Ram K. Sellschop J.P.F. Fischer C.G. Nolting V. |
| Affiliation: | 1.Schonland Research Centre, University of the Witwatersrand, Johannesburg, 2050, South Africa ;2.Institut für Experimentelle Kernphysik, Universit?t Karlsruhe, D-76021, Karlsruhe, Germany ;3.Department of Physics, University of South Africa, Pretoria, 0001, South Africa ;4.Physics Department, University of Durban-Westville, Durban, 4000, South Africa ; |
| Abstract: | TDPAD spectroscopy measurements have been performed on two fullerene samples, C60 and C70, with recoil implanted 19F ions as probe nuclei. Quadrupole coupling frequencies of νQ= 54(1) MHz for C60 and νQ= 57(1) MHz for C70 were observed. These frequencies are associated with a C–F molecular complex formation. The C70 sample was also examined for possible effects due to variation of temperature. No significant changes were observed. An additional frequency of νQ= 13(1) MHz registered for both samples has to be attributed to the formation of H–F complexes. Finally, both samples were analysed for proton dose dependent effects, due to the (p,p'γ) implantation process but no effects have shown up. Specifically, computational studies based on quantum chemical methods were performed to assist in the interpretation of the experimental results, using the code MOPAC. This revised version was published online in August 2006 with corrections to the Cover Date. |
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