We report a method through which experimental rotational transfer (RT) data may be transformed to yield cent-ours of the intermolecular potential. This "inversion" is achieved by fitting state-to-state integral cross sections for well-defined collision energies to an angular momentum (AM) transfer function which expresses the probability of direct conversion of linear to angular momentum. The parameters of this function are directly relatable to the repulsive intermolecular potential. The method is verified by recovering contours of an ab initio potential. The contour dimensions are returned with good accuracy while the average anisotropy is within 2%.