The miniature "tuning fork" inside the AFM used in this IBM Research work. The tuning fork measures the interaction between the tip of the microscope and the atoms on a surface; when the tip is positioned close to an atom on the surface, the frequency of the tuning fork changes slightly. The frequency change can be analyzed to determine the force exerted on the atom. Approximate size of the view: 1.7cm(0.7") x 2.5cm (1")).
