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• W2077702440 abstract "The correlation function of field emission current fluctuations from the (110) plane of tungsten field emitters covered with oxygen has been measured in the range 0.15 ⩽ O/W ⩽ 0.56 for 300 ⩽ T ⩽ 800 K. At intermediate temperatures the experimental correlation functions agree with a theoretical model based on single particle diffusion, and yield diffusion coefficients and activation energies of diffusion of O atoms on this plane. Edif = 14 kcal for O/W ⩽ 0.20 and then increases to 22 kcal for O/W = 0.56. The preexponential D0 = 10−7 cm2 sec−1 at low coverage and increases to 10−4 cm2 sec−1 at high coverage. At high temperatures (600–700 K, depending on θ) the decay of the correlation function is slower than predicted by theory. It is suggested that this results from dynamical correlations, or multi-particle density fluctuations, which can occur when several adsorbate particles are simultaneously in motion. At low temperatures (300–500 K, depending on θ) exponential decay of the correlation function is observed, and explained as a prediffusive flip-flop of O atoms between binding locations. The temperature dependence of the mean square fluctuations in the diffusive regime indicates mean repulsive interactions of 5–8 kcal between O atoms." @default.
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• W2077702440 date "1979-01-01" @default.
• W2077702440 modified "2023-10-09" @default.
• W2077702440 title "Mobility of oxygen on the (110) plane of tungsten" @default.
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• W2077702440 doi "https://doi.org/10.1016/0039-6028(79)90298-x" @default.
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