Allotropic modifications of diamond

Raman, C. V. (1945) Allotropic modifications of diamond Nature, 156 (3949). pp. 22-23. ISSN 0028-0836

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The relationships which exist between the structural symmetry of a molecule and its spectroscopic behaviour have been fully worked out by Placzek. One result of his theory is that if a molecule has the symmetry of the crystallographic point-group Oh, the activity of its vibrations in infra-red absorption and in light-scattering are mutually exclusive. On the other hand, if the molecular symmetry is that of the point-group Td, every vibration of the triply degenerate class must appear both in light-scattering and in infra-red absorption, or else be absent in both.

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Deposited On:04 Aug 2011 07:39
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