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Phonon dispersion curves, far-IR and low-frequency Raman spectra (below 200 cm -1 ) of 4-nitropyridine N-oxide (NPO) including results at high pressure and low temperature are reported and interpreted with the help of a lattice-dynamical calculation using atom-atom Buckingham-type potentials and a multipole expansion up to the quadrupole. The charge transfer process is analysed through...