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We have performed neutron incoherent scattering experiments on KH 2 PO 4 , KD 2 PO 4 , KHCO 3 and KDCO 3 . Their hydrogen excitation spectra and the Q-maps of the neutron scattering function S(Q, ) are observed, and their hydrogen potentials are precisely determined. Based on the obtained hydrogen potentials, their isotope effects on the phase transition temperature are discussed in a whole system of the proton and the lattice.