Other
Scientific paper
Aug 1930
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1930natur.126..169k&link_type=abstract
Nature, Volume 126, Issue 3170, pp. 169 (1930).
Other
Scientific paper
VARIOUS crystalline sulphates have been examined for their Raman spectra by the same method as that used for crystalline nitrates and described previously (NATURE, Mar. 22, p. 463). The results indicate what appears to be a very remarkable influence of the paramagnetism of the cation on the intensities of the Raman lines. This appears very clearly when we compare the spectra of ferrous sulphate crystals (FeSO4, 7H2O) with those of other isomorphous sulphates, for example, magnesium or zinc. In the latter substances, a strong line appears with a frequency shift of about 980 cm.-1. This frequency is characteristic of the SO4-- ion, though its exact value shows considerable variations with the cation present in the crystal. In the spectrum of the ferrous sulphate crystals, however, the line fails to appear even when exposures are given of such duration that the feeble continuous spectrum accompanying the mercury lines comes out strongly on the plate. With aqueous solutions of ferrous sulphate, however, the SO4-- line appears feebly.
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