CAREER: Photodetachment from Nanometer-Sized Particles

职业：纳米尺寸颗粒的光分离

• 批准号: 9876224
• 负责人: Uwe Kortshagen
• 金额: $ 20万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-04-15 至 2004-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9876224&HistoricalAwards=false
• 关键词: CAREER; Photodetachment; Nanometer; Sized; Particles

This project addresses research on basic properties on nanoparticles and the measurement of current unexplored properties such as photodetachment and photoionization. It is suggested that photodetachment of electrons due to UV radiation is an important, to date neglected effect which can lead to more positively charged particles and that it could explain the fast coagulation growth of particles observed experimentally. An experiment to measure the particle photodetachment cross sections is proposed. Negatively charged particles will be grown in, extracted from a pulsed plasma and sent through a UV photodetachment chamber. An excimer lamp will be used to generate narrow-band UV radiation over a wide wavelength range. An electrostatic analyzer will be used to determine the fraction of particles which have experienced photodetachment. The results may lead to an understanding of particle growth in semiconductor plasmas and possibly may show a way to avoid coagulation growth of "killer particles."The educational plan focuses on creating awareness and transmitting excitement about the research area of plasma processing and nanoparticle research. High school students will get a first hand impression of research through short lectures and laboratory visits. High school teachers will be invited to participate in research activities during the summer and be advised in developing exciting "dusty plasma" related classroom experiments. Undergraduate students will be addressed through course development and development of interactive, computer-based teaching materials. Students will experience the excitement of research by working with a research grade plasma simulation code on "virtual plasmas" and by having the opportunity to compare their results to "real" plasmas in laboratory demonstrations. They will also have the opportunity of direct research involvement through research assistantships, and honors thesis projects. Graduate students will benefit from the program, in particular, through the opportunity of international exchange.

本计画主要研究奈米粒子的基本性质，以及目前未开发性质的量测，例如光剥离与光致电离。 有人建议，由于紫外线辐射的电子的光剥离是一个重要的，迄今被忽视的效果，可以导致更多的正电荷的颗粒，它可以解释实验观察到的颗粒的快速凝固生长。 提出了一种测量粒子光剥离截面的实验方法。 带负电荷的粒子将在脉冲等离子体中生长，从脉冲等离子体中提取，并通过UV光分离室发送。 将使用受激准分子灯产生宽波长范围的窄带紫外线辐射。 静电分析仪将用于确定经历光剥离的颗粒的分数。 这些结果可能有助于理解半导体等离子体中的粒子生长，并可能显示出一种避免“杀手粒子”凝结生长的方法。“教育计划的重点是创造意识和传播有关等离子体处理和纳米粒子研究领域的兴奋。 高中学生将通过简短的讲座和实验室参观获得研究的第一手印象。 高中教师将被邀请参加夏季的研究活动，并被建议开发令人兴奋的“尘埃等离子体”相关的课堂实验。 本科生将通过课程开发和互动，基于计算机的教学材料的发展。 学生们将体验研究的兴奋与研究级等离子体模拟代码上的“虚拟等离子体”，并有机会比较他们的结果与“真实的”等离子体在实验室演示。 他们还将有机会通过研究助学金和荣誉论文项目直接参与研究。 研究生将受益于该计划，特别是通过国际交流的机会。