吸附物多余能量的耗散-通过电子转移的热化
Dissipation of the excess energy of the adsorbate- thermalization via electron transfer
摘要：
提出了一种新的固体表面吸附质热化过程的设想。该方案是基于电偶极子层的存在，其中电子波函数在正离子上延伸。因此，存在强的局部电场，其将电子拖入固体中并排斥正离子。电子通过隧道将能量传递到固体内部。正离子在电场中被阻滞，这使它们能够释放多余的动能，并平稳地定位到吸附位点。根据实验，以这种方式，多余的能量不会局部消散，从而避免熔化或产生缺陷。该方案是支持的从头计算结果，包括代表AlN表面的板的密度泛函理论和固体表面的类氢原子的时间演化的薛定谔方程。
英文摘要：
A new scenario of thermalization process of the adsorbate attached at solid surfaces is proposed. The scenario is based on existence of electric dipole layer in which the electron wavefunctions extend over the positive ions. Thus the strong local electric field exists which drags electron into the solids and repels the positive ions. The electrons are tunneling conveying the energy into the solid interior. The positive ions are retarded in the field, which allows them to loose excess kinetic energy and to be located smoothly into the adsorption sites. In this way the excess energy is not dissipated locally avoiding melting or creation of defects, in accordance with the experiments. The scenario is supported by the ab intio calculation results including density function theory of the slabs representing AlN surface and the Schrodinger equation for time evolution of hydrogen-like atom at the solid surface.
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