Surface Melting and Surface Roughening

表面熔化和表面粗糙化

• 批准号: 8703750
• 负责人: Edward Conrad
• 金额: $ 11.22万
• 依托单位: University of Missouri-Columbia
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-08-01 至 1990-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8703750&HistoricalAwards=false
• 关键词: Surface; Melting; Roughening

This proposal describes a series of experiments aimed at addressing the questions of the stability of crystal surfaces at elevated temperatures. The relationship of three types of instabilities on the relatively open surfaces of metals are particularly interesting; surface roughening, surface melting, and irreversible surface reconstructions. Metal surfaces are exceptional candidates to study all three instabilities since the temperatures for these different structural transformations (whether already measured or theoretically predicted) are all very similar for this face. All of these studies require detailed information on the temperature dependence of the long range correlations. This information will be obtained through accurate measurements of low energy electron diffraction profiles. Understanding roughening on metal surfaces will be of extreme interest since the high concentration of active adsorption sites present above the roughening temperature are critical to many important catalytic processes. In addition, surface roughening and surface melting are now recognized as important factors in the growth of semiconductor superlattices and metal-semiconductor interfaces.

该提案描述了一系列旨在 解决晶体表面的稳定性问题， 高温 三种类型的关系 金属相对开放表面上的不稳定性， 特别有趣的是，表面粗糙化，表面熔化， 和不可逆的表面重建。 金属表面 研究这三种不稳定性的杰出候选人， 这些不同结构转变的温度 （无论是已经测量的还是理论上预测的） 和这张脸很相似 所有这些研究都需要 详细信息的温度依赖性的长 距离相关 这些信息将通过 低能电子衍射的精确测量 数据区. 了解金属表面的粗糙化将是 由于高浓度的活性 在粗化温度以上存在的吸附位点是 对许多重要的催化过程至关重要。 此外，本发明还提供了一种方法， 表面粗糙化和表面熔化现在被认为是 半导体超晶格生长中的重要因素 和金属-半导体界面。