Abstract
A new kind of dipole-active surface vibrational resonance has been observed on (110) surfaces of Cu and Ni by electron-energy-loss spectroscopy. An analysis based on lattice dynamics suggests that such resonances should be observable on surfaces where a single bulk-phonon dispersion relation has a pseudo band gap in the probed phonon density of states. In the [110] direction of facecentered-cubic metals this gap is due to the particular geometric structure in that direction.
- Received 9 October 1984
DOI:https://doi.org/10.1103/PhysRevLett.54.1428
©1985 American Physical Society