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In this work, microscopic Raman spectroscopy and component analysis were used to study a calcium nitrate solution with molar water‐to‐salt ratio (WSR) values of 4–320. The results showed that the symmetrical stretching vibration wavenumber of the nitrate ion (v1‐NO3−) in the solution blue shifted from 1,048 to 1,053 cm−1, and the full width at half maximum increased from 9.7 to 11 cm−1 when the WSR...
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