  In this paper we provide further spectral analysis of the general asymptotic
scattering resonances formula of small high contrast 3D dielectrics of
arbitrary shape, initially derived to a first order approximation. To
investigate the components of a full expansion of such resonances, a breakdown
is presented for the case of high contrast nanospheres. We also derive, for
radially symmetric fields, an exact resonance formula for a spherical scatterer
in terms of its radius, not necessarily small, and dielectric susceptibility
coefficient, not necessarily high. Formula that is useful in imaging
applications to identify objects' properties from frequency measurements. The
latter formula is further developed and simplified in the case of high contrast
nanospheres.
