Raman scattering and lattice dynamics of fullerides MxC60
| Autor: | B. N. Mavrin, Anvar A. Zakhidov, Roberto Zamboni, V. N. Denisov, Giampiero Ruani, A. S. Lipin, Carlo Taliani |
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| Předmět: |
Coupling constant
Condensed matter physics Chemistry Mechanical Engineering Jahn–Teller effect Metals and Alloys Condensed Matter Physics Molecular physics Spectral line Electronic Optical and Magnetic Materials symbols.namesake Mechanics of Materials Intramolecular force Excited state Materials Chemistry symbols Raman spectroscopy Excitation Raman scattering |
| Zdroj: | Scopus-Elsevier |
| Popis: | A review of our investigations of Raman spectra of intramolecular and external modes in pristine and doped fullerene C 60 is given. Experimental results are compared with group-theoretical predictions. In low-frequency spectra of M 6 C 60 new bands are found that we have assigned to external modes. An interpretation of M 6 C 60 external modes and lattice dynamics calculations are carried out. From an analysis of the excitation profile of resonant Raman spectra it is found that expected changes of internuclear distances in the excited state of C 60 should be close to the form of the A g mode at 1468 cm −1 . Moreover, a destructive interference of A g modes in M 3 C 60 and M 6 C 60 is observed. The essential broadening, a shift and the Fano lineshape of low-frequency intramolecular H g bands in metallic M 3 C 60 are found. A narrowing of these bands in insulating C 60 and M 6 C 60 indicates the strong electron-phonon interaction of H g Jahn-Teller modes. An estimation of the electron-phonon coupling constants for some modes is given. A possible origin of low-energy electronic excitations appearing in M 3 C 60 resonant Raman spectra at λ i = 1064 nm excitation is discussed. |
| Databáze: | OpenAIRE |
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