The problem of local and resonance vibrational frequencies in a chain with a large number of degrees of freedom in a unit cell is studied. Repeat unit normal coordinates (RUNC's) are suggested as the most convenient representation for the numerical solution of this problem. The formulas obtained are applied to the calculation of local and resonance vibrational frequencies in a polyethylene chain with a single deuterized unit.1% wird das Problem der lokalen und resonanten Schwingungsfrequenzen in einer Kette init einer groden Zahl von Freiheitsgraden in der Einheitszelle untersucht. Als bequemste Darstellung fur die numerische Losung dieses Problems werden ,,Repeat Unit Normal Coordinates (EUNC)" vorgeschlagen. Die erhaltmen Formeln werden auf die Berechnung der lokalen und resonanten Schwingungsfrequenzen in einer Polyethylenkette mit einer einzclnen deuterierten Einheit ange wendet .
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