  We present an analysis of the pairing resonances observed in
photo-double-ionization studies of CnHm aromatic molecules with multiple
benzene-like rings. The analysis, which is based on the Coulomb pairing model,
is applied to naphthalene, anthracene, phenanthrene, pyrene and coronene, all
of which have six-member rings, and azulene which is comprised of a five-member
and a seven-member ring. There is a high energy resonance at ~ 40 eV that is
found in all of the molecules cited and is associated with paired electrons
localized on carbon sites on the perimeter of the molecule, each of which
having two carbon sites as nearest neighbors. The low energy resonance at 10
eV, which is found only in pyrene and coronene, is attributed to the formation
of paired electrons localized on arrays of interior carbon atoms that have the
point symmetry of the molecule with each carbon atom having three nearest
neighbors. The origin of the anomalous increase in the doubly charged to singly
charged parent-ion ratio that is found above the 40 eV resonance in all of the
cited molecules except coronene is discussed.
