Inelastic neutron scattering spectra of alkali metal (Na,K) bifluorides: The harmonic overtone of v3 |
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| Authors: | Thomas C. Waddington Joseph Howard Keith P. Brierley John Tomkinson |
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| Affiliation: | Chemistry Department, University of Durham, South Road, Durham, DH1 3LE, UK;Neutron Division, Rutherford and Appleton Laboratories, Chilton, Oxon OX11 OQX, UK |
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| Abstract: | Inelastic neutron scattering spectra of MFHF (M Na and K) have been measured up to energy transfers of ca. 4000 cm?1 Both 0 → 1 and 0 → 2 transitions of the bending (v2), and antisymmetric stretching (v3) modes were observed. A normal harmonic (i.e. no quartic contribution) model for the dynamics of the bifluoride ion is entirely consistent with our observations. Evidence of phonon dispersion was observed in the band shape of v3, but no structure attributable to the LO mode could be found. The similarity of the band shapes of v3 for both NaFHF and KFHF is interpreted in terms of a very short range coupling mechanism. |
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