Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA.
Phys Rev Lett. 2013 Oct 4;111(14):146102. doi: 10.1103/PhysRevLett.111.146102. Epub 2013 Oct 2.
The rotational and vibrational transitions of a hydrogen molecule weakly adsorbed on the Au(110) surface at 10 K were detected by inelastic electron tunneling spectroscopy with a scanning tunneling microscope. The energies of the j=0 to j=2 rotational transition for para-H(2) and HD indicate that the molecule behaves as a three-dimensional rigid rotor trapped within the tunnel junction. An increase in the bond length of H(2) was precisely measured from the downshift in the rotational energy as the tip-substrate distance decreases.
在 10 K 下，通过扫描隧道显微镜的非弹性电子隧道谱，探测到了弱吸附在 Au(110)表面上的氢分子的转动和振动跃迁。对于 para-H(2)和 HD，j=0 到 j=2 转动跃迁的能量表明分子表现为被限制在隧道结内的三维刚性转子。随着针尖-衬底距离的减小，通过转动能量的下移精确测量了 H(2)的键长增加。
