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A normal coordinates analysis for the hexamminochro mium (III) ion, in octahedral symmetry has been underta ken. A simplified M(NX)6 model has been adopted, since many of the gerade vibrational frequencies are still un known. It is found that a very simple and consistent force field is able to reproduce the observed vibratio nal frequencies as well as gives a reasonable set of for ce constant for this complex ion. This calculation sup ports the assignments, made in literature by several workers.