Abstract
The Verdet constant has been determined for the nitrates of lead, barium and strontium from λ 5780 to λ 3650 A. Dispersion formulae have been constructed for both optical refraction and magneto-optic rotation using the same absorption frequencies in both. In these nitrates it is found that the value of magneto-optic anomaly factor is different for the different absorption wavelengths of the substance and the value of γ for the frequency corresponding to the nitrate ion is extremely low, and is equal to 0·06. The results indicate that the binding in barium and strontium nitrates may be more covalent than that in lead nitrate.
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