Abstract
The Coriolis coupling coefficients of tetrahedral type XY4 transition metal oxides and anions with d 0 configuration of the central atoms which are calculated from M.V.F.F. and G.V.F.F. (method of Fadini) symmetry force constants show a general dependence on the mass ratio mX/mY. There is no such relation for the corresponding values obtained from Urey-Bradley force constants. Experimentally determined ζ constants for OsO4 and RuO4 agree well with the curves ζ=f (mX/mY) for the general and modified valence force fields and are very close to those estimated from the mass ratio alone. The investigation indicates that it is possible to estimate ζ values with simple methods and to use them to obtain possible ranges for force constants.

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