On Birefringence of NaNO2 and NaNO3 and on Anisotropy of Electronic Polarizabilities of NO2 and NO3 Radicals
1981 年 50 巻 6 号 p. 2037-2042
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1981 年 50 巻 6 号 p. 2037-2042
The birefringences of NaNO2 and NaNO3 have been discussed by taking account of the dipole interaction among the Na-ions and the NO2-radicals or NO3-radicals. From the condition necessary to explain the birefringence the electronic polarizabilities of these radicals are obtained. The radicals have generally the anisotropic polarizabilities. It seems valid to attribute this property to the anisotropy of the N–O bond. Among the various models, it can be concluded that the model based upon the bonds is more suitable than that of the dipole model within the region of the radicals. Discussion about the birefringence by comparing with that of CaCO3 is also made.
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