Experimental results concerning the multiphonon scattering of He from the LiF(001) surface, the structure of the NiO(001) surface probed by $\sp3$He scattering, and the structure and dynamics of the CoO(001) surface are presented. Experiments measuring the multiphonon background of He scattered from the LiF surface were used to model the form factor of the interaction for the atom-surface system. This modeling yielded a surface Debye frequency of $\omega\sb{D} = 6.8\times10\sp{13}$ rad/s, the stiffness parameter in the Mott-Jackson matrix element $\beta\ =\ 9.5\ {\rm\A}\sp{-1}$, and a parallel "cutoff" factor $Q\sb{c}\ =\ 8.5\ {\rm\A}\sp{-1}$ for this system. Experiments to determine the structure of NiO using $\sp3$He as the incident probe atom were performed to search for an interaction between the antiferromagnetic ordering in the NiO surface and the nuclear spin in the $\sp3$He. These experiments showed no evidence of any magnetic scattering. It was shown that the mixing of $\sp3$He and $\sp4$He can be used to produce $\sp3$He beams with velocity distributions unobtainable from pure $\sp3$He. Experiments scattering He from the surface of a single crystal CoO sample were used to estimate the peak-to-peak corrugation of CoO for He with an incident wave vector of 6.7 A$\sp{-1}$ at 0.19 A. In addition, the Rayleigh phonon surface dispersion was measured over approximately half of the Brillouin zone. / Source: Dissertation Abstracts International, Volume: 55-09, Section: B, page: 3953. / Major Professor: James G. Skofronick. / Thesis (Ph.D.)--The Florida State University, 1994.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_77266 |
| Contributors | Bishop, Gregory Glenn., Florida State University |
| Source Sets | Florida State University |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | 140 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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