Calibration of the length of a chain of single gold atoms -: art. no. 085418
Calibration of the length of a chain of single gold atoms -: art. no. 085418
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DOI：
10.1103/physrevb.66.085418
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发表时间：
2002-08-15
影响因子：
3.7
通讯作者：
van Ruitenbeek, JM
中科院分区：
文献类型：
--
作者：
Untiedt, C;Yanson, AI;van Ruitenbeek, JM
使用扫描隧道显微镜或机械可控的断裂结，已经表明可以控制由单个金原子制成的线的形成。在这些实验中，链中原子之间的原子间距离被报道为3.6埃，这与最近的理论计算不一致。在这里，使用这两种技术的精确校准程序，我们测量原子链的长度。基于在链长直方图中观察到的峰之间的距离，我们发现链断裂前原子间距离的平均值为2.5+/-0.2埃。该值与键长的理论计算值一致。与以前的实验测量的差异是由于存在的He气体，这是用来促进热接触，并影响的功函数的值，这是常用的校准距离在扫描隧道显微镜和机械可控断开结在低温下。
Using a scanning tunnelling microscope or mechanically controllable break junction it has been shown that it is possible to control the formation of a wire made of single gold atoms. In these experiments an interatomic distance between atoms in the chain of similar to3.6 Angstrom was reported which is not consistent with recent theoretical calculations. Here, using precise calibration procedures for both techniques, we measure the length of the atomic chains. Based on the distance between the peaks observed in the chain length histogram we find the mean value of the interatomic distance before chain rupture to be 2.5+/-0.2 Angstrom. This value agrees with the theoretical calculations for the bond length. The discrepancy with the previous experimental measurements was due to the presence of He gas, that was used to promote the thermal contact, and which affects the value of the work function that is commonly used to calibrate distances in scanning tunnelling microscopy and mechanically controllable break junctions at low temperatures.