  The breakup of the $^{9}$Be projectile on the $^{209}$Bi target at bombarding
energies above and near the Coulomb barrier is studied in the adiabatic
two-center shell model approach. The effect of $^{9}$Be$% \to $n$+2\alpha $
breakup channel on complete fusion, elastic and inelastic cross sections is
investigated. Results show that the breakup of the projectile $^{9}$Be could be
due to a molecular single-particle effect shortly before the colliding nuclei
reach the Coulomb barrier.
