Studies of Molecular Adlayers on the Surfaces of Ionic Crystals

尤因由实验物理化学计划支持开展实验研究，旨在提高离子表面分子吸附过程的基础知识。在一门课中，我们将通过红外光谱研究氢和甲烷的二维量子晶体及其同位素变体的高分辨振动光谱，以阐明这些系统的基本性质。这项研究包括考察维度对分子量子晶体性质的影响。在第二节课中，我们将探讨离子衬底上的亚单分子层、单分子层和薄膜水和冰在环境条件下的性质。热力学性质，如相图，以及气体的溶解度和薄膜内的化学反应将被确定。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。这个项目将导致对分子如何与离子表面相互作用的深入了解，结果具有基本和应用意义。例如，在环境条件下，水的薄膜存在于所有离子表面，并在云的形成、土壤性质、微晶粉末的结块和盐上的化学反应中发挥重要作用。

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.