Rattling modes and the intrinsic vibrational spectrum of beetle-type scanning tunneling microscopes
Rattling modes and the intrinsic vibrational spectrum of beetle-type scanning tunneling microscopes
复制标题
DOI：
10.1016/s0304-3991(03)00086-x
复制
发表时间：
2003-12-01
期刊：
影响因子：
2.2
通讯作者：
McLean, AB
中科院分区：
文献类型：
--
作者：
Miwa, JA;MacLeod, JM;McLean, AB
众所周知，总质量约为3 -4 g的甲虫型扫描隧道显微镜的振动光谱在500 - 1700 Hz的频率范围内包含干扰图像采集的外部“振动”模式。这些模式低于甲虫的最低计算本征频率，有人认为它们是由甲虫在滚道表面粗糙度之间的惯性滑动引起的。在本文中，我们描述了一些交叉耦合的测量，进行了三个自制的甲虫型STM的两种不同的设计。我们提供的证据表明，甲虫的总质量为12-15克的所有模式在嘎嘎作响的范围内是内在的。这为甲虫型扫描隧道显微镜的振动特性可以通过增加甲虫的脚和滚道之间的接触压力来改善的概念提供了额外的支持。(C)2003 Elsevier B. V.保留所有权利。
It is known that the vibrational spectra of beetle-type scanning tunneling microscopes with a total mass of approximate to3-4 g contain extrinsic 'rattling' modes in the frequency range extending from 500 to 1700 Hz that interfere with image acquisition. These modes lie below the lowest calculated eigenfrequency of the beetle and it has been suggested that they arise from the inertial sliding of the beetle between surface asperities on the raceway. In this paper we describe some cross-coupling measurements that were performed on three home-built beetle-type STMs of two different designs. We provide evidence that suggests that for beetles with total masses of 12-15 g all the modes in the rattling range are intrinsic. This provides additional support for the notion that the vibrational properties of beetle-type scanning tunneling microscopes can be improved by increasing the contact pressure between the feet of the beetle and the raceway. (C) 2003 Elsevier B.V. All rights reserved.