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Ultraviolet-visible absorption spectroscopy of carbon onions
Tomita S.1, Hayashi S.1,2, Tsukuda Y.1, Fujii M.2
1Graduate School of Science and Technology, Kobe University, Rokkodai, Nada, Kobe 65, Japan
2Department of Electrical and Electronics Engineering, Faculty of Engineering, Kobe University, Rokkodai, Nada, Kobe 65, Japan
Email: hayashi@eedept.kobe-u.ac.jp
Выставление онлайн: 17 февраля 2002 г.

The optical properties of spherical and polyhedral carbon onions were studied in relation with the strong extinction hump centered at 217.5 nm (4.6 mum-1) in the interstellar extinction curve. The ultraviolet-visible absorption spectra of onions prepared by thermal annealing of diamond nanoparticles were measured. Theoretical calculations for the spherical and polyhedral carbon onions were also carried out to explain the experimental spectra. One of the authors (S.T.) is grateful to the financial support by a Research Fellowship of the Japan Society for the Promotion of Science (JSPS) for Young Scientist. This work is founded by a Grant-in Aid for Scientific Research from the Ministry of Education, Science, Sports, and Culture, Japan, and a Grant for the Future Program from the JSPS (JSPS--RFTF--98P--01203).
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