Thermodynamic Properties of Antarctic Stratospheric Clouds

本项目的目的是测量南极平流层云粒子的热力学和物理化学性质。这些极地平流层云（PSC’s）被认为是由硝酸、盐酸和水组成的，几乎可以肯定，它们在破坏南极洲上空的臭氧方面起着非常重要的作用。受助人将在实验室中，在接近平流层的条件下，使用经典的物理化学技术，在精心制备的溶液的受控部分冷冻的基础上，制造平衡固体。蒸汽压和热力学性质，如汽化热，将直接使用二极管激光光谱测量。这项工作被认为对更好地理解PSC粒子上发生的化学反应至关重要。

It is the purpose of this project to measure the thermodynamic and physical-chemical properties of Antarctic stratospheric cloud particles. These polar stratospheric clouds (PSC's) are believed to be made up of nitric acid, hydrochloric acid and water, and they are almost certainly play very important roles in the destruction of ozone over Antarctica. The grantees will manufacture equilibrium solids in the laboratory under near- stratospheric conditions using classical physical-chemical techniques, based on controlled partial freezing of carefully prepared solutions. The vapor pressures and thermodynamic properties, such as heats of vaporization, will be measured directly using diode laser spectroscopy. The work is considered to be crucial for better understanding of the chemistry that takes place on the PSC particles.