Irradiation of Condensed Gas Solids: Physical Mechanisms and Astrophysical Implications

凝结气体固体的辐照：物理机制和天体物理意义

• 批准号: 9801928
• 负责人: Robert Johnson
• 金额: $ 15.32万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-15 至 2002-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9801928&HistoricalAwards=false
• 关键词: Irradiation; Condensed; Gas; Solids; Physical

Robert Johnson University of Virginia Dr. Robert Johnson, University of Virginia, will continue a study of the effects of ion bombardment and ultraviolet radiation on low temperature solid surfaces. Sputtering of ices is a process that has proved to be important in determining the reflectance of the icy satellites of planets in the Solar System. There now exist a large body of laboratory data on the sputtering of ices. This data set has some inconsistencies and large gaps in the materials, incident particles, and particle energies studied. Dr. Johnson will calculate complete data sets for those ices that are critical to the understanding of the surfaces of outer Solar System objects. He will also calculate how these data can be applied to icy satellite regoliths that have grain sizes and porosities much different from those in laboratory studies. The data will be used on the production of molecular oxygen and hydrogen to quantitatively test the various solid-state chemistry models that have been proposed for the production and desorption of new volatiles during irradiation of ice.

弗吉尼亚大学罗伯特·约翰逊博士将继续研究离子轰击和紫外线辐射对低温固体表面的影响。事实证明，在确定太阳系行星的结冰卫星的反射率时，冰的溅射是一个重要的过程。现在有大量关于冰块溅射的实验室数据。此数据集在所研究的材料、入射粒子和粒子能量方面存在一些不一致和很大的差距。约翰逊博士将计算这些冰层的完整数据集，这些冰层对于理解太阳系外天体的表面至关重要。他还将计算如何将这些数据应用于冰冻的卫星巨石，这些巨石的颗粒大小和孔隙率与实验室研究的结果有很大不同。这些数据将用于分子氧和氢的产生，以定量测试已提出的各种固态化学模型，这些模型用于在辐射冰期间产生和解吸新的挥发物。