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28 November 1994 Research in astrophysics gives new optical materials
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The discovery in 1985 by Kroto, Heath, O'Brien, Curl and Smalley of the existence of a new form of carbon known as Buckminsterfullerene or C60 initiated a new field of carbon research. The development of the field was however rather limited and it was not until Kratschmer, Lamb, Fostiropoulos and Huffman developed a technique for production of macroscopic amounts that a number of new applications became possible. Originally Kratschmer and Huffman had the intention to explain an observed strong extinction from interstellar dust and produced a special carbon soot with a characteristic optical absorption known as `the camel hump smoke'. The observed absorption was in rather good agreement with excitation energies and oscillator strengths for C60 evaluated by Larsson, Volosov and Rosen (one of the authors) in 1987, using the semi-empirical CNDO/S-CI method. This good agreement seems to have encouraged Kratschmer and Huffman to continue with the development of the technique. This paper gives a historical overview and a presentation of recent calculations of optical spectra for C60 in the gas phase and the dielectric constants for films of C60 with a comparison with experimental data.
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Arne Rosen, E. Westin, and Daniel Oestling "Research in astrophysics gives new optical materials", Proc. SPIE 2284, Fullerenes and Photonics, (28 November 1994);

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