U.S.-Japan Cooperative Research: Study of Phase Transition Dynamics by Coherent Phonon Excitation

美日合作研究：相干声子激发研究相变动力学

• 批准号: 9418058
• 负责人: Keith Nelson
• 金额: $ 2.29万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-04-01 至 1999-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9418058&HistoricalAwards=false
• 关键词: U.S.; Japan; Cooperative; Research; Study

9418058 Nelson This award supports a three-year cooperative research project between Dr. Keith Nelson of the Massachusetts Institute of Technology and Dr. Toshirou Tagi of Hokkaido University. The collaborators will investigate lattice vibrations in crystals near phase transitions, acoustic waves in glass-forming liquids and polymers, and acoustic waves in polymers and other thin films. The study of phase transitions and liquid-glass transitions is intended to advance our fundamental understanding of structural rearrangements in condensed matter. The study of thin films can provide important information about adhesion of films to substrates, and also has immediate applications to noninvasive characterization of films in microelectronics and other industries. The U.S. group, led by Dr. Nelson, has developed picosecond and femtosecond time-domain light scattering methods for study of acoustic and optic phonons in condensed matter. Of particular interest for the Japanese group, led by Dr. Yagi, is the use of femtosecond time-resolved methods for the study of phase transitions in an important class of crystals whose nonlinear optical properties are widely exploited in practical devices. The mutual benefits of the collaboration will be two-way technology transfer for the significant enhancement of both groups experimental capabilities, intellectual exchange concerning the related topics of interest to both groups, and collaborative experimental results on structural phase transitions in two important classes of materials. ***

9418058 Nelson 该奖项支持麻省理工学院的 Keith Nelson 博士和北海道大学的 Toshirou Tagi 博士之​​间为期三年的合作研究项目。 合作者将研究相变附近晶体中的晶格振动、玻璃形成液体和聚合物中的声波以及聚合物和其他薄膜中的声波。 相变和液体玻璃化转变的研究旨在增进我们对凝聚态物质结构重排的基本理解。 薄膜的研究可以提供有关薄膜与基材粘附力的重要信息，并且还可以直接应用于微电子和其他行业中薄膜的非侵入性表征。 由尼尔森博士领导的美国研究小组开发了皮秒和飞秒时域光散射方法，用于研究凝聚态声子和光学声子。 由八木博士领导的日本小组特别感兴趣的是使用飞秒时间分辨方法来研究一类重要晶体的相变，这些晶体的非线性光学特性在实际设备中被广泛利用。 合作的共同利益将是双向技术转让，以显着增强双方的实验能力，就双方感兴趣的相关主题进行知识交流，以及在两类重要材料的结构相变方面的合作实验结果。 ***