Laboratory Simulation Studies of EUV-VUV Photolysis of Cosmic Ice Analogs

宇宙冰类似物 EUV-VUV 光解的实验室模拟研究

• 批准号: 1108898
• 负责人: Chung-Yung Wu
• 金额: $ 29.84万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1108898&HistoricalAwards=false
• 关键词: Laboratory; Simulation; Studies; EUV; VUV

The surfaces of icy Solar System bodies are predominantly water ice, with small amounts of methane, carbon monoxide, carbon dioxide, nitrogen, and ammonia. The outer surfaces are constantly subject to photon irradiation and particle bombardment, the solar wind, cosmic rays, and chemical reactions on surfaces, in addition to thermal cycling. In this project, the collaborating team will continue, with renewed NSF support, their laboratory experiments on the physics of extreme ultraviolet (EUV)-vacuum ultraviolet (VUV) photolysis of cosmic ice analogs. They plan simultaneous investigations of photon-induced chemical reactions and photodesorption in ice analogs containing water and other relevant species. A tunable intense synchrotron radiation light source available at the National Synchrotron Radiation Research Center (NSRRC), Taiwan, will provide the required EUV-VUV photons. The team will identify the type of molecules that form in the ice samples, and those that come off the ice surfaces, quantify their production yields, understand their production mechanisms, the destruction yields (lifetimes or stabilities) of the parent ice molecule(s), and ascertain their significance in astronomical environments. Much of the sophisticated equipment and advanced experimental techniques required for the proposed work have been developed by the team with prior NSF funding. The results will be particularly relevant to understanding of the water-rich icy satellites of the giant planets, comets, the interstellar medium, molecular clouds, and protostellar regions. The research results will also be incorporated into teaching materials for advanced undergraduate and graduate courses. The project will train a postdoctoral associate and a graduate student, with an emphasis on working with a synchrotron radiation facility.

冰冷的太阳系天体表面主要是水冰，有少量的甲烷、一氧化碳、二氧化碳、氮气和氨。除了热循环外，外表面还经常受到光子照射和粒子轰击、太阳风、宇宙射线和表面上的化学反应。在这个项目中，合作小组将在美国国家科学基金会的新一轮支持下，继续他们关于宇宙冰类似物的极端紫外线(EUV)-真空紫外线(VUV)光解物理的实验室实验。他们计划在含有水和其他相关物种的类似冰中同时研究光子诱导的化学反应和光解吸。台湾国家同步辐射研究中心(NSRRC)提供的可调谐强同步辐射光源将提供所需的EUV-VUV光子。该团队将确定在冰样中形成的分子的类型，以及从冰面上下来的分子，量化它们的产量，了解它们的产生机制，母冰分子(S)的破坏产量(寿命或稳定性)，并确定它们在天文环境中的意义。这项拟议的工作所需的许多尖端设备和先进的实验技术都是由该团队在NSF之前的资助下开发的。这些结果将对理解巨行星、彗星、星际介质、分子云和原恒星区域的富水冰卫星特别相关。研究成果还将被纳入高级本科和研究生课程的教材。该项目将培训一名博士后助理和一名研究生，重点是与同步辐射设施合作。