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1 66 Er Mossbauer and inelastic neutron scattering measurements were performed on the tetragonal intermetallic compound ErCu 2 Si 2 (T N = 1.65(5) K). From the inelastic neutron scattering results a crystal field diagram has been determined. The r 166 Er Mossbauer spectra show direct relaxation between the split levels of the magnetic ground state doublet of the I 4 I 15/2 multiplet.