Abstract
It is pointed out that, on account of their high symmetry, the A 1 modes of vibration of neopentane are specially favourable for testing bond-polarizability theories of Raman intensities. A normal co-ordinate treatment of these modes is given and a modified bond-polarizability theory is applied to the observed relative Raman intensities. It is shown that the derivative of the mean molecular polarizability with respect to the symmetrical deformations of the methyl groups must be small relative to the derivatives with respect to bond-stretchings. Thus for these modes the simple bond-polarizability theory, involving Wolkenstein’s assumption that the polarizability of a bond is not affected by changes in the bond orientation, represents a good approximation.
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Schedule a callMore From: Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
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