Diatomic molecular switches to enable the observation of very-low-energy vibrations

Phys Rev Lett. 2007 Sep 21;99(12):126104. doi: 10.1103/PhysRevLett.99.126104. Epub 2007 Sep 21.


Using low-temperature scanning tunneling microscopy and spectroscopy, we found that the coadsorption of atomic hydrogen to single transition-metal and rare-earth-metal atoms on a Ag(100) surface gives rise to surprising phenomena, a bias dependent switching from a large to a small apparent size of the diatomic molecules and a concomitant appearance of very low-energy vibrational features of 3 to 7 meV in the differential conductance spectra. These phenomena, which have until now escaped observation, may be of general relevance for low-temperature adsorption.