Geometrical properties of intelligent spin states and time evolution of coherent states

We recall the properties of the intelligent (and quasi-intelligent) spin states introduced by Aragone et al (1974 J. Phys. A: Math. Gen. 7 L149, 1976 J. Math. Phys. 17 1963). We use these states to construct families of coherent wavepackets (WP) on the sphere and we sketch the time evolution of these WP for a rigid-body molecule.