  In this paper we report results for magnetic observables of finite spin
clusters composed of S=1/2 ions. We consider clusters of two, three and four
spins in distinct spatial arrangements, with isotropic Heisenberg interactions
of various strengths between ion pairs. In addition to the complete set of
energy eigenvalues and eigenvectors, specific heat and magnetic susceptibility,
we also quote results for the single crystal and powder average inelastic
neutron scattering structure factors. Examples of the application of these
results to experimental systems are also discussed.
