Spectroscopic Studies of Structures and Defect Activities ofIcy Clusters and Thin Films

冰团簇和薄膜的结构和缺陷活动的光谱研究

• 批准号: 9023277
• 负责人: J. Paul Devlin
• 金额: $ 21.63万
• 依托单位: Oklahoma State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-04-01 至 1994-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9023277&HistoricalAwards=false
• 关键词: Spectroscopic; Studies; Structures; Defect; Activities

Professor Devlin is supported by a grant from the Experimental Physical Chemistry Program to study icy thin films and clusters, including crystalline ice, amorphous ice and acid hydrates using infrared spectroscopy. The data acquired will enhance our understanding of natural processes such as nucleation and growth of icy particles in the atmosphere, the molecular-level processes at ice surfaces that lead to charge separation in electrical storms, and proton conductivity across and along biomembrane-water interfaces. The influence of surfaces, interfaces and intense near-infrared radiation on point-defect activities (ionic: hydrogen and hydroxyl ions, and orientational: L and D) of hydrogen-bonded solids will be examined in icy thin films and clusters, including ice I, amorphous ice, acid hydrates and clathrate hydrates. Fourier transform infrared and Raman spectroscopies will be used to monitor isotopic exchange rates for samples containing nonequilibrium quantitites of protium and deuterium isotopomers. These experiments will take advantage of a technique recently developed by Devlin based on observations that the absorption bands of OH groups that dangle from the surfaces are distinct from the OH groups which are involved in hydrogen bonds. These methods will be applied to the evaluation of the hypothesis that phase transitions of icy substances are critically dependent on the availability of mobile orientational defects.

德夫林教授得到了实验基金会的资助。 物理化学计划，研究冰冷的薄膜和 集群，包括结晶冰，无定形冰和酸 水合物使用红外光谱。 获取的数据将 提高我们对自然过程的理解， 大气中冰粒子的成核和生长， 冰表面的分子级过程导致电荷 电风暴中的分离和质子传导性 和沿着生物膜-水界面。 表面、界面和强近红外的影响 点缺陷活动的辐射（离子：氢和 羟基离子和取向：L和D）的氢键 固体将在冰薄膜和团簇中被检查， 包括冰I、无定形冰、酸水合物和包合物 水合物 傅里叶变换红外和拉曼光谱 将用于监测样本的同位素交换率 含有非平衡量的氚和氘 同位素这些实验将利用 Devlin最近根据观察结果开发的技术 悬挂在表面的OH基团的吸收带 表面不同于参与的OH基团， 氢键这些方法将被应用到评价中 冰物质的相变 严重依赖于移动的 取向缺陷