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- W1968393003 abstract "The kinetics of desorption for Cs and Cs+ from basal graphite surfaces at surface temperatures of 1220–1530 K was studied by the field reversal method. In this case, the peak ion signal after a period with retarding field, in the range 1 micros to 2 ms, was measured. This peak signal is directly related to the surface density of Cs at the end of the retarding period. An analytical description, which includes rapid diffusion into the bulk, is shown to give good agreement at relatively short times, while a normal desorption pattern applies at longer times. Under the present high temperature conditions, diffusion via the grain boundaries is generally a relatively slow process. The detailed kinetic model, which was used in our previous studies, agrees well with the results. A few rate parameters were redetermined independently and are shown to agree within error limits. The diffusion process connecting the upper and lower migrating states is shown to have a small pre-exponential factor, indicating a grain boundary coverage of 10−3. The very rapid diffusion into the bulk was once more found to have a pre-exponential of 1025 st̄1. It is proposed that this process involves the ionization of a Rydberg state outside the surface." @default.
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- W1968393003 date "1988-10-01" @default.
- W1968393003 modified "2023-09-25" @default.
- W1968393003 title "Rate constants for cesium bulk diffusion and neutral desorption on pyrolytic graphite basal surfaces: A field reversal kinetic study" @default.
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- W1968393003 doi "https://doi.org/10.1016/0039-6028(88)90270-1" @default.
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