Raman spectra of crystalline sulphates of zinc, magnesium and sodium
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The Raman spectra of single crystals of the sulphates of zinc, magnesium, magnesium-ammonium and sodium (both thenardite and Glauber’s salt) have been investigated using the λ 2537 resonance radiation of mercury as exciter. The important results obtained may be summarised as follows:—
Zinc: 56, 70, 104, 128, 151, 212, 252 and 373 cm.−1;
Magnesium: 56, 75, 97, 118, 150, 252 and 303 cm.−1;
Magnesium-ammonium: 54, 89, 130, 147, 198, 220 and 265 cm.−1;
Thenardite: 52, 76, 122 and 164 cm.−1; and
Glauber’s salt: 53, 134, 158, 231 and 292 cm.−1 The Raman lines of the hydrated sulphate are found to be more diffuse than the corresponding lines of the anhydrous sulphate. The results obtained have been discussed in the light of the known structures of these crystals.
KeywordsRaman Spectrum Frequency Shift Raman Line Magnesium Sulphate Zinc Sulphate
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