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UBC Theses and Dissertations

Leed studies on two surfaces of copper Parkin, Sean Richard


The work presented in this thesis includes investigations using low energy electron diffraction (LEED) of the clean stepped Cu(311) surface and its interactions with sulphur, and also for a half monolayer oxygen superstructure on Cu(110) designated Cu(110)-(2x1)-O. In each case, intensity versus energy (1(E)) curves were measured with a video LEED analyzer for sets of independent diffracted beams for future comparison to the results of multiple scattering calculations. The clean Cu(311) surface was cut and polished from a single crystal copper rod and cleaned by sputter-etching with argon ions followed by annealing. Intensity measurements were recorded for 14 symmetry inequivalent diffraction beams at normal incidence, followed by six at 10° off normal incidence. Adsorption of sulphur on the Cu(311) surface was carried out by dosing with H₂S followed by its presumed dissociation and loss of hydrogen to the vacuum. This study indicated that S atoms order themselves on Cu(311) only in the [Oil] direction. In addition to experimental work on the Cu(311) surface, a discussion is made of the difficulties associated with the application of LEED to adsorption on stepped surfaces. The Cu(110)-(2x1)-O stucture was prepared by the adsorption of oxygen on the (110) surface of copper. The conditions necessary to produce the best LEED pattern were found by analysis of adsorption spot profiles, and experimental LEED 1(E) curves were recorded for nine independent beams at normal incidence and a further six at 10° off normal incidence.

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