U.S.-Bulgaria Cooperative Research on Ion Beam Deposition of Two Component Films

这项由保加利亚科学院J.Wayne Rabalais博士和S.S.Todorov博士合作的美国-保加利亚研究项目将研究人工结构材料的低能离子束沉积(IBD)机制。重点是离子-表面的基本相互作用，包括衬底结构、缺陷、扩散、湮灭和温度以及离子能量、类型和电荷的影响。将使用一种新的、独特的、脉冲的、双束的、质量选择的离子束沉积系统来研究双组分薄膜的沉积。用电子能谱和离子散射对薄膜进行了原位表征，用X射线衍射仪、透射电子显微镜、背散射和拉曼光谱对薄膜进行了非原位表征。其目的是确定离子束合成外延和有序结构以及具有有趣的电学和/或机械性能的新材料的机制。其目标是了解和控制用于低温合成新的多组分材料和亚稳态固体的离子束过程。这项工作应该会改善我们对薄膜生长过程的基本理解，这些过程发生在过热物种的沉积过程中，以及由此产生的薄膜结构和性能。这个材料科学项目通过使美国和东欧的顶尖专家能够将互补的人才结合在一起，并在相互感兴趣和能力很强的领域汇集资源，从而实现了促进科学知识的计划目标。

This U.S.-Bulgaria research project between Dr. J. Wayne Rabalais and Dr. S. S. Todorov of the Bulgarian Academy of Sciences will study the mechanism of low energy ion beam deposition (IBD) of artificially structured materials. The focus is the fundamental ion- surface interactions, including the influence of substrate structure, defects, diffusion, annihilation, and temperature along with ion energy, type, and charge. Deposition of two-component films will be studied by using a new, unique, pulsed, dual-beam, mass- selected ion beam deposition system. The films will be characterized in situ by electron spectroscopy and ion scattering and ex situ by XRD, TEM, RBS, and Raman. The objectives are to determine the mechanism of ion beam synthesis of epitaxial and ordered structures and new materials with interesting electrical and/or mechanical properties. The goal is to understand and control ion beam processes for low temperature synthesis of new multicomponent materials and metastable solids. This work should lead to an improvement of our fundamental understanding of film growth processes that occur during deposition of hyperthermal species and the resulting film structure and properties. This project in materials science fulfills the program objective of advancing scientific knowledge by enabling leading experts in the United States and Eastern Europe to combine complementary talents and pool resources in areas of strong mutual interest and competence.