Force Distance Spectroscopy measures the mechanical interaction force between a tip and a sample. In the attractive force regime, it measures the “pull-off” force or bonding strength of sample surface, while in the repulsive force regime, the relative stiffness.
For precise measurement in pico-Newton scale, one needs Superluminescence (SLD) head, closed-loop Z scanner, and spring constant calibration. The SLD head with low coherency and the closed-loop Z scanner ensure precise distance control and accurate Z-speed control respectively. The spring constant calibration of a cantilever allows acquisition of quantitative force data.
For the product information of this advanced SPM mode offered by Park Systems, please click here.