Abstract
A model is developed that describes unusual phenomena in oxygen desorption from tungsten surfaces: (1) in temperature-programmed desorption (TPD) in the transfer from the linear regime of sample heating to the isothermal regime, a maximum of the desorption rate is observed; (2) in the stepped partial desorption of oxygen, the beginning of each subsequent TPD peak shifted toward higher temperatures; (3) the apparent activation energy of desorption increased in the latter case by a factor of ∼3 (from 280 to 920 kJ/mol). Monte Carlo modeling that takes into account surface migration of adsorbed oxygen atoms and their lateral interactions gave semiquantitative description of experimental data.
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