Riedo E, Gnecco E, Bennewitz R, Meyer E, Brune H
Institut de Physique des Nanostructures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
Phys Rev Lett. 2003 Aug 22;91(8):084502. doi: 10.1103/PhysRevLett.91.084502. Epub 2003 Aug 19.
The friction force on a nanometer-sized tip sliding on a surface is related to the thermally activated hopping of the contact atoms on an effective atomic interaction potential. A general analytical expression relates the height of this potential and the hopping attempt frequency to measurements of the velocity dependence of the friction force performed with an atomic force microscope. While the height of the potential is roughly proportional to the normal load, the attempt frequency falls in the range of mechanical eigenfrequencies of the probing tip in contact with the surface.
在表面上滑动的纳米尺寸尖端上的摩擦力与接触原子在有效原子相互作用势上的热激活跳跃有关。一个通用的解析表达式将该势的高度和跳跃尝试频率与用原子力显微镜进行的摩擦力速度依赖性测量联系起来。虽然势的高度大致与法向载荷成正比，但尝试频率落在与表面接触的探测尖端的机械本征频率范围内。
