We have made measurements of the far-infrared absorption at 7^∘{}K in NaCl. The natural Cl³⁵ and Cl³⁷ isotopes acting as simple mass defects result in absorption in the acoustic band and yield information about phonon frequencies at critical points. The theory of this effect is derived and applied to NaCl. Similar measurements on LiF are also reported. We believe this to be the first observation of isotope-induced band-mode absorption in alkali halides.
No takes yet. Share an insight, caveat, or question.
Klein et al. (1968) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: