[en] The existence of local and band modes of hydrogen and deuterium impurities in α-palladium hydride was observed by inelastic scattering of thermal neutrons of 12.6 meV. The first and second harmonic of the hydrogen local mode could be observed at Esub(1)sup(H)=(66+-4)meV and Esub(2)sup(H)=(135+-15)meV. For deuterium the first harmonics appears at Esub(1)sup(D)=(48+-4)meV. The width of the hydrogen local mode Esub(1)sup(H) is changing from 30 to 20 meV and its position from 63 to 66meV if the hydrogen concentration is altered from 2.7 to 0.2 atom percent. The intensity of the Esub(1)sup(H) mode, integrated for scattering angles from 11⁰ till 68⁰ and a mean k-vector pointing in the [210]-direction, is decreasing by a factor of 5 with respect to harmonic oscillator while the intensity of the second harmonic Esub(2)sup(H) and of the band modes stays almost constant if the temperature is changed from 423⁰K till 673⁰K. The behavior of this intensity distributions with temperature indicates a partition of the proton motions in diffusive and localized motions and supports the assumption of an anharmonic periodic potential along the [110] direction. The frequency distribution function of the hydrogen band modes has a shape as expected from measured dispersion curves. For [Pdsub(0.018)sup(D)-Pd] a broad quasielastic line is observed that indicates the existence of overdamped phonons in the vicinity of the impurity atom