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Existing first principles calculations for H chemisorbed on jellium are interpreted by a simple model which reproduces the main one-body features of the results. The relationship with a picture of the H 1s orbital coupling to substrate wavefunctions is thus brought out. 相似文献
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Application of a simple wave function-matching technique is made to the problem of alkali adsorption on free-electron like substrates, giving in particular an estimate of the width of the resonance at a given adatom-substrate separation, which is then compared to existing first-principles calculations. The model is then applied to the alkali/transition-metal problem, thus assuming the non-importance of the transition-metal d-bands relative to their sp-bands. The results indicate a fair amount of hybridization between the ns and np valence levels of the alkali adatom. 相似文献
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We calculate the ionization probability for singlet and triplet metastable He(1s2s) atoms scattered from potassium covered surfaces, on the basis of the resonant tunnelling process. We do not assume the trajectory approximation, but we do assume classical motion on the potential energy curves, with crossing between neutral and ionic curves at a given point calculated from electronic tunnelling probabilities. Energy spectra of the He+ ions are also calculated. The results are found to be somewhat sensitive to tunnelling probability as a function of distance from the surface. Results are compared with experimental ionization probabilities measured by Roussel. The agreement is found to be fair if the tunneling rate is parameterized according to the theory of Janev et al. A simple interpretation is given. 相似文献
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