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From temperature-dependent x-ray integrated intensity measurements on single crystals of calcium fluoride, we have demonstrated the presence of anharmonic fluorine-atom vibrations. For the cubic term in the single-particle fluorine potential we arrive at a value of β=-(4.5±1.5)×10^-12 erg/³. The experimentally determined temperature factors at 25^∘{}C are BCa(≡8π²〈μₛ²〉Ca)=0.525±0.01 ² and BF=0.787±0.03 ².
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Strock et al. (1972) studied this question.
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