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- W1977314127 abstract "Because of the limited time resolution of the scanning tunneling microscope (STM), tunneling images of monatomic steps on surfaces display sudden jumps in the position of steps from one scan line to the next. We have studied the time structure of the step jump events experimentally as well as theoretically by invoking Monte Carlo simulations of the motion of atoms alongside steps and also analytical modeling. The discussion focuses on a time and temperature regime where the mean time between step jumps is comparable to, though larger than, the time between two scan lines. Then, two regimes can be distinguished in the probability distribution to find a particular time interval between step jumps. On a short time scale, the time structure is dominated by the return of adatoms to the same kink from where they had been emitted. Step jumps with a long time interval between them correspond to a random walk of kinks where the adatom on the average does not return to the same kink within the time necessary to emit the next adatom. Analytical expressions for the probability of step jumps in the two time regimes are derived and compared to the results of the Monte Carlo simulations. The experimental data are analyzed with the help of the analytical theory and the activation energies for the emission of adatoms from kinks and for the hopping of adatoms alongside the steps are determined." @default.
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- W1977314127 date "1994-09-01" @default.
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- W1977314127 title "On the time structure of tunneling images of steps" @default.
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- W1977314127 doi "https://doi.org/10.1016/0039-6028(94)91141-x" @default.
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