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Topics in Current Chemistry

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Solid Sulfur Allotropes 79 226. (a) K. Kusaba, T. Kikegawa, in: Photon Factory Activity Report, High Energy Accelera- tor Research Organization (KEK), Japan, 2000, 18B, p. 200. (b) K. Kusaba, T. Kikegawa, in: Photon Factory Activity Report, High Energy Accelerator Research Organization (KEK), Japan, 2000, 17B, p. 228. 227. J. S. Tse, D. D. Klug, Phys. Rev. B 1999, 59, 34. 228. The spectral peculiarities of a-S resemble those of the more or less disordered chains in S􏰺 as well as those of large rings Sx (x~20–50) [43, 151, 205]. Therefore, it is likely that there is no principal difference between large disordered rings (Sx) and disordered chains (present in S􏰺, for example). 229. M. J. Peanasky, C. W. Jurgensen, H. G. Drickamer, J. Chem. Phys. 1984, 81, 6407. 230. K. Syassen private communication of unpublished results. 231. (a) A. K. Abass, A. K. Hasen, R. Misho, J. Appl. Phys. 1985, 58, 1640. (b) A. K. Abass, N. H. Ahmad, J. Phys. Chem. Solids 1986, 47, 143. 232. W. Häfner, J. Kritzenberger, H. Olijnyk, A. Wokaun, in: Twelfth International Confer- ence on Raman Spectroscopy (J. R. Durig, J. F. Sullivan, eds.), Wiley, Chichester, 1991, p. 448. 233. W. Häfner, H. Olijnyk, A. Wokaun, High Press. Res. 1990, 3, 248. 234. Y. A. Kandrina, A. N. Babushkin, S. N. Shkerin, Y. Y. Volkova, Defect Diffusion Forum 2002, 208-209, 295. 235. In these studies the optical absorption edge was defined as the energy of light at a transmission of 1%, that is an optical density of 2 (OD=2). Although common, this def- inition does not reflect the true absorption edge, which has to be evaluated more strict- ly, for example, using the so-called Urbach equation. 236. S. K. Sikka, Metals Materials and Processes 1992, 3, 303; S. M. Sharma, S. K. Sikka, Progress in Material Science 1996, 40, 1. 237. G. Doerre, J. D. Joannopoulos, Phys. Rev. Lett. 1979, 43, 1040.

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