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In this thesis the glueball spectrum to be expected is studied by means of a potential model which is based on a Breit-Fermi Hamiltonian for states of two gluons (gluonium):Chapter II contains an extensive motivation of the model proposed here. It follows the calculation of the Breit-Fermi Hamiltonian as well as the construction of the long-range part of the potential. Finally the spectrum is calculated with all spin-dependent corrections up to order 1/c exp 2 . A discussion of the mining of gluonium with quarkonium as well the decays of gluonium contains the chapter III. In chapter IV the influence of the gluon condensate on the gluonium states is calculation. Chapter V is a summary and discussion of all results. (ERA citation 11:015065)