Debye-Waller factor of sodium: A comparison of theory and experiment

We have compared the Debye-Waller factor of sodium calculated by three different theoretical methods with the recent measured values in the temperature range 80–295 K, using the Mo¨ssbauer γ-ray-scattering technique. The Mo¨ssbauer results are also compared with the two sets of earlier x-ray measurements, one of which extends to 365 K. The three theoretical methods are the following: the lowest-order anharmonic perturbation theory, a …