Studies of Molecular Adlayers on the Surfaces of Ionic Crystals

尤因是由实验物理化学计划的支持，进行实验研究，旨在推进离子表面的分子吸附过程的基础知识。 在一类中，氢和甲烷及其同位素变体的二维量子晶体的高分辨率振转光谱将通过红外光谱学来研究，以阐明这些系统的基本性质。 这项研究包括检查的分子量子晶体的性质的维数的作用。 在第二类中，亚单层，单层和薄膜水和冰的离子基板附近的环境条件下的属性将进行探讨。热力学性质，如相图将被确定，以及薄膜内的气体溶解度和化学反应。 这些实验的结果将影响对环境现象的理解，并增加对水与离子表面相互作用的基本理解。 离子晶体或盐在自然界中无处不在。 该项目将导致深入了解分子如何与离子表面相互作用，结果具有基础和应用意义。 例如，在环境条件下，水薄膜存在于所有离子表面上，并且在云的形成、土壤性质、微晶粉末的结块和盐的化学反应中起重要作用。

Ewing is supported by the Experimental Physical Chemistry Program to carry out experimental studies that aim to advance fundamental knowledge of molecular adlayer processes at ionic surfaces. In one class, the high resolution rovibrational spectroscopy of two dimensional quantum crystals of hydrogen and methane and their isotopic variants will be studied via infrared spectroscopy to elucidate the fundamental nature of these systems. This study includes examining the role of dimensionality on the properties of molecular quantum crystals. In the second class, properties of submonolayer, monolayer, and thin film water and ice on ionic substrates near ambient conditions will be explored. Thermodynamic properties such as phase diagrams will be determined, as well as gas solubility and chemical reactions within the thin films. Outcomes from these experiments will impact the understanding of environmental phenomena, as well as increase the basic understanding of water interactions with ionic surfaces. Ionic crystals, or salts, are ubiquitous in nature. This project will lead to insights into how molecules interact with ionic surfaces, outcomes with both fundamental and applied implications. For example, thin films of water exist on all ionic surfaces under ambient conditions, and play important roles in cloud formation, soil properties, caking of crystallite powders, and chemical reactions on salts.