INNER-PRODUCT PERTURBATION-THEORY - ENERGY-LEVELS OF DOUBLE-WELL POTENTIALS FOR 2-DIMENSIONAL QUANTUM-SYSTEMS BY EXPANDING THE POTENTIAL FUNCTIONS AROUND THEIR MINIMA

Energy eigenvalues of double-well potentials for two-dimensional syste ms are calculated by the approach of expanding the potential functions such as V(x, y; Z(2), lambda) = -Z(2)[x(2) + y(2)] + lambda[x(4) + 2x (2)y(2) + y(4)] around their minima, using the inner product technique , for various values of perturbation parameters Z(2) and lambda. Some of the results calculated by the inner product technique are compared with the results produced by other means.