Vibrational Modes of Deuterium in KD₂PO₄

抄録

In order to study the deuteration effect in hydrogen-bonded compounds such as KH₂PO₄, hydrogen and deuterium modes in KH₂PO₄ and K(D_xH_1−x)₂PO₄ (x=95%) were investigated by means of inelastic neutron-scattering measurements over a wide energy range. By comparing Raman spectra of KH₂PO₄ and KD₂PO₄ with neutron-scattering spectra, the vibrational modes of deuterium and those of PO₄ tetrahedrons in the energy range of 30<ε<150 meV have been investigated. At least two deuterium modes have been found at 87 meV and 106 meV.