Vibrational Modes of Deuterium in KD2PO4

Abstract

In order to study the deuteration effect in hydrogen-bonded compounds such as KH 2 PO 4 , hydrogen and deuterium modes in KH 2 PO 4 and K(D x H 1- x ) 2 PO 4 ( x =95%) were investigated by means of inelastic neutron-scattering measurements over a wide energy range. By comparing Raman spectra of KH 2 PO 4 and KD 2 PO 4 with neutron-scattering spectra, the vibrational modes of deuterium and those of PO 4 tetrahedrons in the energy range of 30< e <150 meV have been investigated. At least two deuterium modes have been found at 87 meV and 106 meV.