Raman studies of nonlinear phenomena in fullerene crystallites |
| |
Authors: | H J Byrne L Akselrod C Thomsen A Mittelbach S Roth |
| |
Institution: | (1) Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany |
| |
Abstract: | The resonant Raman scattering of C60 crystallites is monitored as a function of excitation intensity at 514.5 nm. At low intensities, a strong line at 1468 cm–1 is observed. No feature at 1459 cm–1 is observable. With increasing intensities, the 1468 cm–1 line shifts continuously and reversibly to lower frequencies. The mode softening is nonlinearly dependent on the input intensity and is accompanied by a nonlinear increase in the Raman intensity. The spectral changes are discussed in terms of a nonlinear reduction in force constant and increase in bond polarisability as a result of an increased intermolecular delocalisation of the -electron cloud. The nonlinear changes are associated with the nonlinear luminescence and photoconductive response observed in fullerenes and are contrasted to the irreversible phototransformation recently discussed. |
| |
Keywords: | 33 00 35 00 78 30 |
本文献已被 SpringerLink 等数据库收录! |