摘要
近期的实验表明跳触现象（ｊｕｍｐｔｏｃｏｎｔａｃｔ）很可能是摩擦的起源．所谓跳触就是当针尖和平的表面距离很近时二者会突然接触从而形成“连颈”．在用扫描隧道显微镜研究这种现象的过程中，利用电导随时间的演变曲线，我们发现扫描隧道显微镜针尖和铅（１１０）样品表面间的这种连颈在被拉伸到一定程度后，会自发变细直到拉断．
Abstract Recent studies show that the so called “jump to contact” phenomenon, which often happens between a sharp tip and a flat surface in close proximity and results in formation of a neck between the two, is probably the origin of friction. By studying the phenomenon with a scanning tunneling microscope (STM) and monitoring the conductance evolution, we have found that such necks between the STM tip and the Pb(110) sample surface, after being stretched to a certain degree, may shrink spontaneously till its break. The fact that surface cleanness and temperature have significant influence on the shrinking process suggests that the process is a result of surface diffusion of Pb atoms.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第4期688-693,共6页
Acta Physica Sinica
基金
国家自然科学基金
高等学校博士学科点专项科研基金
