Excitation functions of the projectile-like fragments in the dissipative reaction F-19+V-51 have been measured at theta(1)=21.7 degrees, 36.1 degrees and 40.5 degrees. The incident energies are from 102.25 to 109.50 MeV in 250 keV steps. The energy coherence width Gamma and the rotation angular velocities omega of the corresponding dinuclear systems are extracted. The coherence rotation and its importance in the reaction process are discussed.