In nucleus-nucleus collisions there exists a large probability for the
formation of the molecular orbitals of active nucleons in the scatter
ing systems. In nuclear reactions the exact treatment of the relative
motion and allowance for recoil effects due to the mass transfer are c
learly more important for nucleon molecular orbitals than for electron
molecular orbitals. In order to treat this problem, we discuss first
our formalism for the dynamical treatment of molecular orbitals by usi
ng the basis functions employed in the coupled-reaction-channel (CRC)
method. Then the rotating-molecular-orbital (RMO) representation for a
ctive nucleons is applied for the systems C-12 + C-13 and S-36 + Cl-37
. We put special emphasis on a specific molecular orbital state, i.e.,
a covalent molecule which appears as a rotating stable state (k=1/2)
with good adiabaticity.