  Combining recent and new inelastic neutron scattering data for the molecular
cyclic cluster Cr8 produces a deep understanding of the low lying excitations
in bipartite antiferromagnetic Heisenberg rings. The existence of the L-band,
the lowest rotational band, and the E-band, essentially spin wave excitations,
is confirmed spectroscopically. The different significance of these excitations
and their physical nature is clearly established by high-energy and
Q-dependence data.
