Anhydrous lithium perchlorate has been examined in the crystalline and molten state by infrared and Raman spectroscopy. In the crystalline phase all degenerate modes are split but the Raman and infrared spectra are essentially identical in the internal frequency region. In the molten state the spectra are more simple but no coincidences exist between infrared and Raman spectra. The spectra are interpreted in terms of a crystalline symmetry perturbation for both the solid and molten salts. The symmetry of the perturbing field is shown to change in going from the solid to the melt. An explanation of the melt spectra in terms of contact ion pairs is considered and dismissed. Observed vibrational frequencies and assignments are given.

The infrared and Raman spectra of NaClO3 and NaNO2 are reported in crystalline and molten states. The Raman spectra of melts of LiClO3, KClO3, AgClO3, and KKO2 are also reported. The melts all show well-developed lattice-like vibrations which are quite distinct from the crystalline vibrations both in energy and intensity. The spectra are interpreted on the basis of a lattice-like structure in the melt.

The Raman spectra of the equimolar mixture of Cd(NO3)2 and TlNO3 in the glassy and crystalline states have been measured over a range of temperatures. The alternative interpretations of the results in terms of distinct anion sites or a continuum of cation distributions are examined. Strong similarities between the spectra of the crystalline and glassy states indicate that three anion sites predominate. In two of these, the environment is dominated by either cadmium ions or thallium ions, whereas the third appears to have a mixture of the two cations.