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尼尔森该奖项支持马萨诸塞州理工学院的基思·尼尔森博士与北海道大学的Toshirou Tagi博士之间的为期三年的合作研究项目。 合作者将研究晶体中近相变的晶格振动，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。 相变和液态玻璃转变的研究旨在促进我们对凝结物质结构重排的基本理解。 对薄膜的研究可以提供有关膜对底物的粘附的重要信息，并且在微电子和其他行业中膜的非侵入性表征也立即应用。 由尼尔森博士领导的美国组已开发出缩放物质中的声音和光秒的光域光散射方法，用于研究声音和光学声子。 由Yagi博士领导的日本群体特别感兴趣的是使用飞秒时间分辨的方法来研究一类重要晶体类别的相变，其非线性光学特性在实际设备中被广泛利用。 协作的相互利益将是两组实验能力的显着增强，涉及两组相关主题的智力交流以及对两种重要材料类别的结构相变的协作实验结果的智力交流。 ***