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- W2014165092 abstract "The conditions enabling the transition of surface-adsorbed hydrogen atoms into bulk metals are explored by comparing the response of chemisorbed H on Pd(100) and Ti(0001) single crystals to thermal activation in vacuum. Thermal desorption spectroscopy and $^{1}text{H}(^{15}text{N},ensuremath{alpha}ensuremath{gamma})^{12}text{C}$ nuclear reaction analysis reveal that heating causes ${text{H}}_{2}$ desorption from Pd(100), whereas H atoms on Ti(0001) reversibly exchange between the surface and the Ti bulk with negligible desorption loss of ${text{H}}_{2}$. A general model is proposed in which the competition between desorption and bulk absorption of surface hydrogen is, on one hand, kinetically determined by the activation energy for associative ${text{H}}_{2}$ desorption relative to the effective energy barrier for H absorption. On the other hand, the thermodynamic possibility to dissolve the surface H atoms into the metal must be considered to consistently explain the opposite behavior of H on Pd(100) and Ti(0001). The first experimental estimation of the energy of surface adsorption, ${ensuremath{epsilon}}_{s}=ensuremath{-}0.92text{ }text{eV}$, for H/Ti(0001) is presented, in good agreement with theoretical calculations." @default.
- W2014165092 created "2016-06-24" @default.
- W2014165092 creator A5003983147 @default.
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- W2014165092 date "2008-09-09" @default.
- W2014165092 modified "2023-10-10" @default.
- W2014165092 title "Penetration mechanisms of surface-adsorbed hydrogen atoms into bulk metals: Experiment and model" @default.
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- W2014165092 doi "https://doi.org/10.1103/physrevb.78.115411" @default.
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