Irradiation of Condensed Gases by Fast Ions: Physical Mechanisms and Astrophysical Implications

快离子辐照凝聚气体：物理机制和天体物理意义

• 批准号: 8817700
• 负责人: Robert Johnson
• 金额: $ 17.29万
• 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: 1989
• 资助国家: 美国
• 起止时间: 1989-02-01 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8817700&HistoricalAwards=false
• 关键词: Irradiation; Condensed; Gases; Fast; Ions

There are numerous examples of astrophysical phenomena where knowledge of the effect of bombardment of ices by charged particles is crucial. Cosmic ray particles in the Galaxy modify gases and organics which are condensed on the mantles of interstellar ice grains. Ions in the solar wind and from solar flares, which bombarded ice grains and icy materials in the early stages of the evolution of the Solar System, altered the chemical nature of those materials which then accreted to form objects such as comets. Bombardment by plasma ions in the magnetospheres of the outer planets can alter the spectral characteristics of the surfaces of the satellites and rings of these planets. With this grant, Drs. Johnson and Boring, at the University of Virginia, in collaboration with colleagues at AT&T Bell Laboratories will continue their laboratory study of the changes produced in the spectral and chemical properties of icy surfaces when bombarded by energetic, charged particles. The experimental results will be used to understand the spectral alteration of icy grains and the production of large molecules in the interstellar medium, the modification of the surfaces of the satellites and rings of the outer planets, and the effect of long term ion bombardment on cometary debris and pre-cometary materials.

在许多天体物理现象的例子中，了解带电粒子轰击冰的影响是至关重要的。银河系中的宇宙射线粒子改变了凝聚在星际冰粒地幔上的气体和有机物。在太阳系演化的早期阶段，太阳风和太阳耀斑中的离子轰击冰粒和冰状物质，改变了这些物质的化学性质，然后这些物质被吸积形成了彗星等物体。外行星磁层中等离子体离子的轰击可以改变这些行星的卫星和环表面的光谱特征。有了这笔资金，dr。弗吉尼亚大学的Johnson和Boring将与at &amp；T Bell实验室的同事合作，继续他们的实验室研究，当高能带电粒子轰击时，冰表面的光谱和化学性质会发生变化。实验结果将用于了解星际介质中冰粒的光谱变化和大分子的产生，外行星卫星和环表面的修饰，以及长期离子轰击对彗星碎片和前彗星物质的影响。