Charging, Relaxation, and Polarization of Free Metal Nanoclusters

自由金属纳米团簇的充电、弛豫和极化

• 批准号: 0098533
• 负责人: Vitaly Kresin
• 金额: $ 43.04万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-01 至 2004-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0098533&HistoricalAwards=false
• 关键词: Charging; Relaxation; Polarization; Free; Metal

The focus of this research project is on the electronic, thermal, and surface properties of alkali nanoclusters ranging in size from 10 to 10,000 atoms. The experiments will be carried out on free clusters in beams, generated in vapor expansion sources, and detected by mass spectrometers. In this way, nanoclusters can be studied as a function of precisely known size and without distortions caused by substrate effects. The project aims to understand: (1) the fate of slow electrons attracted and captured by the cluster polarization potential; (2) the temperature dependence of the electric dipole polarizability of clusters; and (3) the origin of highly efficient charge transfer in collisions of clusters with surfaces. All these phenomena are related to the dynamics of mobile cluster electrons. They touch upon the fundamental physics of finite many-body systems and surfaces, such as carrier scattering and electron-vibrational coupling in nanoscale systems, the interplay between structural and electronic properties, thermal expansion, and the melting transition.

该研究项目的重点是大小为 10 至 10,000 个原子的碱金属纳米团簇的电子、热和表面特性。 实验将在光束中的自由团簇上进行，这些团簇是在蒸汽膨胀源中产生的，并由质谱仪检测。 通过这种方式，可以将纳米团簇作为精确已知尺寸的函数进行研究，并且不会因基底效应而造成扭曲。 该项目旨在了解：（1）被团簇极化势吸引和捕获的慢速电子的命运； (2)团簇电偶极子极化率的温度依赖性； (3)团簇与表面碰撞中高效电荷转移的起源。 所有这些现象都与移动团簇电子的动力学有关。 它们涉及有限多体系统和表面的基础物理学，例如纳米级系统中的载流子散射和电子振动耦合、结构和电子特性之间的相互作用、热膨胀和熔化转变。