High resolution helium atom scattering (HAS) experiments were performed on the disordered surface of KCN(001) in the rhombohedral phase and on expitaxial grown layers of KBr on RbCl(001). The experiments on KCN used the time-of-flight (TOF) method to measure multiphonon interactions of the incident helium atoms with the crystal surface as a function of incident energy and crystal temperature. These measurements were used to model a cutoff factor ($Q\sb{c} = 4.5{\rm\A}\sp{-1}$) for parallel momentum transfer, a range parameter ($\beta$ = 4.5A$\sp{-1}$) of an exponential potential $V\propto$ exp(-$\beta z$), and a surface Debye temperature ($\Theta\sb{S}$ = 195K). / The experiments with RbCl involved the deposition of one to three monolayers of KBr onto the RbCl(001) surface, which was monitored in situ by attenuation of the atomic helium beam. Inelastic scattering experiments were performed on each atomic layer to determine the surface phonon dispersion curves as a function of coverage. This experiment was performed to validate and also, to provide additional results that will extend the shell model for ionic insulators. Measurements were made in both the ${\overline{\Gamma M}}$ and ${\overline{\Gamma X}}$ high symmetry directions for coverages of one, two, and three monolayers. The KBr/RbCl system which is nearly perfectly lattice matched is compared to the KBr/NaCl system which has lattice registry of 6 KBr to 7 NaCl. / Source: Dissertation Abstracts International, Volume: 55-09, Section: B, page: 3955. / Major Professor: J. G. Skofronick. / Thesis (Ph.D.)--The Florida State University, 1994.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_77269 |
| Contributors | Gillman, Edward S., Florida State University |
| Source Sets | Florida State University |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | 123 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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