研究粒子-氧/过渡金属体系电荷转移对氧化、侵蚀、多相催化等工业领域的发展具有重要意义。碱金属正离子中性化技术是探测该体系电荷转移的有效途径。然而此类研究很少，人们不清楚中性化机理，甚至对过渡金属表面的中性化机理也没有定论。因此我们结合已有的研究基础，拟采用位置灵敏探测技术与飞行时间谱等技术，开展低能碱金属正离子与过渡金属Cu、Pd表面及其氧化物超薄膜体系散射中性化的实验。将0.2-5keV的Li+、Na+离子由离子枪引出，分别与过渡金属和其氧化物超薄膜表面散射。通过调节入射能量、入射角度以及薄膜厚度来研究表面氧化过程中复杂的表面环境对中性化的影响，并与Cu、Pd表面的结果进行对比，从而揭示表面几何结构和电子结构变化与中性化的微观联系，弥补宏观表面功函不能完全解释共振中性化的不足。该项目不仅为碱金属离子中性化技术的应用积累研究数据，而且有助于理解粒子-氧/过渡金属体系的电荷转移机理。

Particle-O/transition metal interactions play an important role in a number of technological processes, such as oxidation, corrosion, and heterogeneous catalysis.A good approach to studying the charge transfer process is the neutralization of alkali positve ions. However, such studies are fairly scarce and we do not understand the neutralization mechanism,even on the transition metals. We thus plan to study the neutralization of low-energy alkali positve ions scattering on transition metal surfaces (Cu,Pd)and O/transition metal collision systems, based on our recent work, using the time-of-flight and position-sensitive technique. The 0.2-5keV Li+,Na+ ions from the ion gun scatter from the surface in the ultrahigh chamber. Change the incident energy, incident angle and the thickness of the ultrathin films, we can investigate the role of the oxygen adatoms as compared with the results from the bare metal surface,find out the relationship between neutralization and the geometrical structure and electronic properties and complement the weakness of the surface workfunction to explain the renonant neutralization. This not only collects the research data for the application of the alkali ion neutralization,but also is helpful for understanding the charge transfer mechanism for particle-O/transition metal system.