Abstract
Various harmonic force models are used to fit experimental k = 0 lattice vibration frequencies in LaCl 3, CeCl 3, PrCl 3 and LaBr 3. It is shown that a very approximate model using only two parameters gives a reasonable fit to six or more frequencies. This is not greatly improved by the use of more sophisticated models. The k = 0 eigenvector for a particular choice of force constants is also given.
Published Version
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