## Measurement of the short-range attractive force between Ge plates using a torsion balance

Kim, W. J.
Sushkov, A. O.
Dalvit, D. A. R.
Lamoreaux, S. K.
##### Description
We have measured the short-range attractive force between crystalline Ge plates, and found contributions from both the Casimir force and an electrical force possibly generated by surface patch potentials. Using a model of surface patch effects that generates an additional force due to a distance dependence of the apparent contact potential, the electrical force was parameterized using data at distances where the Casimir force is relatively small. Extrapolating this model, to provide a correction to the measured force at distances less than 5 $\mu$m, shows a residual force that is in agreement, within experimental uncertainty, with five models that have been used to calculate the Casimir force.
Comment: 5 pages and 4 figures, version 2
Quantum Physics