Anharmonic surface vibrations in photoemission from alkali metals
- 15 January 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 49 (3), 2277-2280
- https://doi.org/10.1103/physrevb.49.2277
Abstract
The phonon widths of outermost core-electron photoemission spectra from (110)-oriented overlayers of Na, K, and Rb metals show the expected Debye behavior for the bulk atoms, but significant deviations for the surface atoms. The data indicate a softening of the surface vibrational mode above 200 K. This effect, which is weak in Na but strong in K and Rb, demonstrates that the vibrational mode normal to the surface is anharmonic.Keywords
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