  The aim of this article is to present the interference effects which occur
during the time evolution of simple angular wave packets (WP) which can be
associated to a diatomic rigid molecule (heteronuclear) or to a quantum rigid
body with axial symmetry like a molecule or a nucleus. The time evolution is
understood entirely within the frame of fractional revivals discovered by
Averbukh and Perelman since the energy spectrum is exactly quadratic. Our
objectives are to study how these interference effects differ when there is a
change of the initial WP. For this purpose we introduce a two parameter set of
angular momentum coherent states. From one hand this set emerge quite naturally
from the three dimensional coherent states of the harmonic oscillator, from
another hand this set is shown to be buit from intelligent spin states.We have
also compared our coherent states to some previously constructed using boson
representation of angular momentum. The time evolution of coherent states for
symmetric top is also discussed.
