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Mean amplitudes of vibration of the pseudo-trigonal bipyra-midal PF 4  − anion have been calculated from vibrational spectroscopic data in the temperature range between 0 and 1000 K. The results are briefly discussed in relation to the structural peculiarities of the anion and some comparisons with related species are made.

Mean Amplitudes of Vibration of the Tetrafluorophosphite, PF 4 − , Anion