| dc.contributor.author |
Bruch, L. W. |
|
| dc.contributor.author |
Novaco, Anthony D. |
|
| dc.date.accessioned |
2011-03-14T14:05:30Z |
|
| dc.date.available |
2011-03-14T14:05:30Z |
|
| dc.date.issued |
2000-02-15 |
|
| dc.identifier.citation |
Bruch, L. W. and A. D. Novaco (2000). "Anharmonic effects on monolayer phonons." Physical Review B 61 (8): 5786-5792 |
en_US |
| dc.identifier.uri |
http://hdl.handle.net/10385/810 |
|
| dc.description.abstract |
The anharmonic frequency shifts of the phonons in monolayer solids of Ar/Pt(lll) and commensurate Xe/Pt(lll) are calculated with quasiharmonic perturbation theory and with self-consistent-phonon theory. Results from the two methods are in good agreement for Ar/Pt(lll). Uncertainties in the frequency shifts for the Ar/Pt(lll) modes are small compared to present uncertainties in the interaction model and in the experimental data. Anharmonic effects in the commensurate Xe/Pt(lll) solid at 80 K are large, both because of the small adatom-adatom force constants in this dilated lattice and because of the large degree of thermal excitation. A version of the improved self-consistent-phonon approximation is used for comparison to experimental data, and it is found that the anharmonic terms cause changes on the scale of adjustments in Xe-Pt forces previously found necessary to achieve fits of the harmonic theory to the data. The contribution of static adsorption-induced dipole moments to the monolayer lattice dynamics is analyzed and is found to be negligible for Xe/Pt(111). |
en_US |
| dc.publisher |
Physical Review B |
en_US |
| dc.title |
Anharmonic effects on monolayer phonons |
en_US |
| dc.type |
Article |
en_US |