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An empirical constraint for the determination of the force constants of a General Valence Force Field for the tetrahedral halides with the general formula AX 4  n  (where A = an element of the groupe II, III, IV, V and VI; X = F, Cl, Br and I and n = +1, 0, -1 and -2) is presented. The model is defined by a constant value of the parameter p= (f t  -f tt ) / (f t  + 3f tt ). The optimum value, p = 0.73, obtained for the mixed halides of chlorobromomethane is compared with those calculated from other force fields commonly used.

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On the Calculation of the Force Constants for Halides AX 4  n  (Td). Using an Empirical Constraint F 33  (F 2 )/F 11  (A 1 ) = Constant for Similar Molecules and Ions