Xu Chen, Chiang Chi-Lun, Han Zhumin, Ho W
Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA.
Department of Chemistry, University of California, Irvine, California 92697-2025, USA.
Phys Rev Lett. 2016 Apr 22;116(16):166101. doi: 10.1103/PhysRevLett.116.166101. Epub 2016 Apr 21.
Single molecule vibrational spectroscopy and microscopy was demonstrated in 1998 by inelastic electron tunneling with the scanning tunneling microscope. To date, the discussion of its application has mainly focused on the spatial resolution and the spectral energy and intensity. Here we report on the vibrational line shape for a single carbon monoxide molecule that qualitatively exhibits inversion symmetry when it is transferred from the surface to the tip. The dependence of the line shape on the molecule's asymmetric couplings in the tunnel junction can be understood from theoretical simulation and further validates the mechanisms of inelastic electron tunneling.
1998年，通过扫描隧道显微镜的非弹性电子隧穿实现了单分子振动光谱和显微镜技术。迄今为止，关于其应用的讨论主要集中在空间分辨率、光谱能量和强度方面。在此，我们报告了单个一氧化碳分子的振动线形，当它从表面转移到尖端时，定性地表现出反演对称性。线形对分子在隧道结中不对称耦合的依赖性可以从理论模拟中得到理解，并进一步验证了非弹性电子隧穿的机制。
