Enhancement of fluorescence and Raman spectroscopies of undoped C60 film
| Autor: | Pan Hai-Bin, Fu Shaojun, Zhang Xinyi, Zuo Jian, Shi Jun-Yan, Xu Cun-Yi, Xia Andong, Hong Yilin |
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| Rok vydání: | 1995 |
| Předmět: |
Chemistry
Biophysics Analytical chemistry chemistry.chemical_element General Chemistry Condensed Matter Physics Biochemistry Fluorescence Oxygen Atomic and Molecular Physics and Optics symbols.namesake Reaction rate constant symbols Photooxygenation Work function Irradiation Raman spectroscopy Excitation |
| Zdroj: | Journal of Luminescence. 63:301-308 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/0022-2313(94)00073-l |
| Popis: | The spectroscopic characteristics of C60 films deposited on different substrates have been investigated at room temperature. We find that the fluorescence of C60 film is enhanced by the presence of a rough silver surface and also by oxygen under excitation at 5145 A (2.41 eV) at room temperature. The enhancement of the fluorescence on the rough silver surface is mainly due to an appropriate work function of the silver surface and an external electromagnetic field induced by laser irradiation, which leads to a resonant coupling with the C60 molecular dipole. The fluorescence enhancement by oxygen is interpreted as resulting from the strong reduction in symmetry of C60 from Ih to C2v or lower due to photooxygenation of the C60 molecules. This also results in larger Jahn-Teller distortions. The kinetics of the photochemical reactions between oxygen and C60 have also been obtained with an observed rate constant of magnitude about 1.6 × 10−2s−1 by monitoring the changes of the fluorescence and Raman spectra with the irradiation time. |
| Databáze: | OpenAIRE |
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