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A quantitative relation has been derived for the mean-square amplitudes of internuclear distances in a tetrahedral XY4 molecule when vibronic interactions are present. The calculation has revealed that, first, the mean-square amplitude lY—Y increases by the presence of vibronic interactions and second, the effect is large when the frequency of the degenerate vibration ν2 is low.
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Hiromichi Uehara (1966) studied this question.
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