  We propose an approach to detect individual Rydberg molecules with each
molecule consisting of two atoms in different Rydberg states. The scheme
exploits the movement of atoms in the presence of an external force that exerts
only on atoms in one Rydberg state. Since the movement of atoms in the other
Rydberg state depends on whether they are bound with atoms directly driven by
the applied force, bound atoms can be distinguished from unbound atoms. By
utilizing electromagnetically induced transparency, it is possible to
non-destructively image the positions of molecules. The scheme is sensitive to
a weak force, which is suited to optically detect spatial positions and bond
structure of Rydberg molecules.
