Abstract

The nonlinear Bastiansen-Morino shrinkage effects are studied for (a) planar symmetrical XY 3, and (b) tetrahedral XY 4 molecular models. In both of these cases the so-called anharmonicity terms vanish. The shrinkage effects are expressed algebraically in terms of the mean-square amplitude matrix elements. Numerical values are given for the trihalides of boron, and germanium tetrachloride. In the case of GeCl 4 the result is compared with that from electron-diffraction data. Finally, the electron-diffraction r g values for this molecule are refined to fit accurately the presently calculated shrinkage effect.

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