Abstract
The Raman spectra of the ν1(A′1) mode of NO−3 ions in molten LiNO3–RbNO3 mixtures are measured at various concentrations and at temperatures from 478 to 750 K. Rotational correlation functions are calculated from the Raman spectra. Reorientation of the trigonal axis of an NO−3 ion is found to be represented by the inertial rotation of an associated ion cluster for short times and by the rotational diffusion at longer times. The speeds of inertial rotation and rotational diffusion are found to increase as the temperature rises and as the mole fraction c(Li+) of LiNO3 decreases.
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