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Roger Haydock’s research interests center on electronic structure, interatomic forces, and electronic processes in solids. The most challenging problems in this area concern surfaces, defects, alloys, and glasses.
His work on surfaces began with the discovery that electronic energy bands narrow at surfaces, an effect that was later observed in photoemission and helps to explain variations in the chemical reactivity of surfaces. This led to a theory of surface photoemission which takes the surface electronic structure into account explicitly. Nickel surfaces were studied in a series of calculations which elucidated charge transfer and the nature of oxygen chemisorption, leading to an explanation of oxygen overlayer structures on nickel. Another aspect of this is a theory of field evaporation from metals, which demonstrated that multiply-charged ions were produced by field ionization after evaporation. Recent work on surfaces includes an investigation of chemical reactivity near metals, and suggestions of mechanisms producing grain boundary embrittlement by impurities. The forces between helium atoms and metal surfaces were shown to involve significant effects of hybridization and image potentials. Recent projects include the effect of impurity atoms on surface plasticity, second harmonic generation of light from metal surfaces, and a study of surface tunnelling states.
Another theme of this research is structural phase stability of pure materials, compounds, and alloys. This began with a theory of the structural variations across the three rows of the transition series and went on to calculations of the structures of the Laves phases of transition metal compounds. Study of the formation of magnetic moments at iron sites in various compounds has led to theories of iron magnetism near the Curie temperature.
His work on surfaces began with the discovery that electronic energy bands narrow at surfaces, an effect that was later observed in photoemission and helps to explain variations in the chemical reactivity of surfaces. This led to a theory of surface photoemission which takes the surface electronic structure into account explicitly. Nickel surfaces were studied in a series of calculations which elucidated charge transfer and the nature of oxygen chemisorption, leading to an explanation of oxygen overlayer structures on nickel. Another aspect of this is a theory of field evaporation from metals, which demonstrated that multiply-charged ions were produced by field ionization after evaporation. Recent work on surfaces includes an investigation of chemical reactivity near metals, and suggestions of mechanisms producing grain boundary embrittlement by impurities. The forces between helium atoms and metal surfaces were shown to involve significant effects of hybridization and image potentials. Recent projects include the effect of impurity atoms on surface plasticity, second harmonic generation of light from metal surfaces, and a study of surface tunnelling states.
Another theme of this research is structural phase stability of pure materials, compounds, and alloys. This began with a theory of the structural variations across the three rows of the transition series and went on to calculations of the structures of the Laves phases of transition metal compounds. Study of the formation of magnetic moments at iron sites in various compounds has led to theories of iron magnetism near the Curie temperature.
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