Abstract
The Reman spectra of alkali-nitrates, including RbNO3 and CsNO3, were examined in single crystals and also in their aqueous solutions. In crystals, the frequency shift corresponding to the inactive vibration of NO3-group does not decrease with the increase of atomic number of cathion. This will imply that the frequency shift depends not only on the atomic number of cathion, its valency and the amount of water of crystallization, but on the crystal system to which a crystal belongs. Some new lines were observed, which had not been found by using the specimen in powder form.
On the other hand, in the aqueous solutions, the frequency shift seems to decrease very slowly with the increase of atomic number of cathion. The Raman spectra of calcite and aragonite were obtained for comparison with those of NaNO3 and KNO8 respectively. Nitrates behave in a similar manner to carbonates, though not in minor detail
