Faculty Awards for Women Scientists and Engineers

美国国家科学基金会女科学家和工程师教师奖认可获奖者在教学和奖学金方面的高质量记录，以及潜在的研究，学术职业和未来科学家和工程师的教育。库珀博士在该奖项下的研究是针对理解高能离子束与清洁和吸附质覆盖的单晶金属表面的相互作用。过热离子-表面散射（入射能量低于500 eV）的动力学具有重要意义，因为在过热能量状态下，离子从热散射（离子与整个表面同时相互作用）转变为keV散射（离子与单个表面原子经历一系列连续的二元碰撞）。高温散射动力学也具有重要的实际意义，因为这种能量状态用于技术应用，如反应离子蚀刻和离子束辅助外延。为了研究这些动力学，从清洁和吸附物覆盖的金属表面散射具有良好特征的离子束。特别强调的是理解散射动力学的各个方面，如能量转移到表面和粒子捕获，以及理解离子表面电荷转移的机制。最初的研究将使用碱离子束，因为碱离子表面反应相对简单，可以对散射和电荷转移动力学进行详细的建模。散射动力学研究目前正在进行中的Na+散射从Cu(001)，并将扩展到其他碱和其他光束种类，如氧和氮。对于Li+， Na+和K+离子表面电荷转移机制的研究目前正在进行中。它们将扩展到其他事件物种，特别是原子氧和分子氧。扫描隧道显微镜（STM）是一种与离子散射互补的用于研究局部原子和电子表面性质的探针。STM将在超高真空条件下用于研究金属表面的隧穿机制、吸附剂对金属表面电子结构的影响以及金属表面的扩散。

The NSF Faculty Awards for Women Scientists and Engineers recognizes the high quality of the awardee's record in teaching and scholarship, as well as potential research, the academic profession, and the education of future scientists and engineers. Dr. Cooper's research under this award is directed at understanding the interactions of energetic ion beams with clean and adsorbate- covered single crystal metal surfaces. The dynamics of hyperthermal ion-surface scattering (incident energies below 500 eV) are of fundamental interest because it is in the hyperthermal energy regime that the transition occurs from thermal scattering,in which the ion interacts simultaneously with the entire surface to keV scattering, where the ion undergoes a series of sequential binary collisions with individual surface atoms. Hyperthermal scattering dynamics are also of practical importance since this energy regime is used in technological applications such as reactive ion etching and ion beam assisted epitaxy. To study these dynamics, well-characterized ion beams are scattered from clean and adsorbate-covered metal surfaces. Particular emphasis is placed on understanding aspects of the scattering dynamics, such as energy transfer to the surface and particle trapping, and on understanding mechanisms of ion-surface charge transfer. The initial studies will use alkali ion beams since the relative simplicity of alkali ion-surface reactions permits detailed modeling of the scattering and charge transfer dynamics. Scattering dynamics studies are currently underway for Na+ scattering from Cu(001), and will be extended to other alkalis and to other beam species, such as oxygen and nitrogen. Investigations to determine the mechanisms of ion-surface charge transfer are currently underway for incident Li+, Na+, and K+. They will be extended to other incident species, in particular atomic and molecular oxygen. A probe that is complementary to ion scattering for studying local atomic and electronic surface properties is the scanning tunneling microscope (STM). STM will be used in ultra high vacuum to study tunneling mechanisms on metal surfaces, the effect of adsorbates on the electronic structure at metal surfaces, and diffusion on metal surfaces.