The Schrِdinger equation for bound state systems in the oscillator representation

In the nonrelativistic Schrِdinger equation the Wick-ordering method called the oscillator representation is proposed to calculate the energy spectrum for a wide class of potentials allowing the existence of a bound state. The results of the zeroth approximation oscillator representation are in very good agreement with the exact values for anharmonic potentials. The perturbation series converges fairly fast, i.e., the highest perturbation corrections over the interaction Hamiltonian are small enough.