Study of Photon Sputtering of H2O Ices Under In-Situ Conditions

原位条件下水冰的光子溅射研究

• 批准号: 9115670
• 负责人: Chung-Yung Wu
• 金额: $ 19.35万
• 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: 1992
• 资助国家: 美国
• 起止时间: 1992-03-15 至 1995-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9115670&HistoricalAwards=false
• 关键词: Study; Photon; Sputtering; H2O; Ices

The goal of these researchers is to study solar photon sputtering of molecular water ices from the vacuum ultraviolet through the extreme ultraviolet wavelength region in the laboratory. The temperatures for the ices will be chosen to simulate realistic planetary conditions. Sputtering of atoms and molecules from surfaces of astronomical materials is an important process for mass transfer and evolution in a number of astronomical environments, such as comets, asteroids, icy planets, satellites, rings, and interstellar dust grains. The excitation sources for sputtering are solar photons, solar wind, magnetospheric particles, and micrometeorites. Experiments on sputtering by energetic ions have been carried out in several laboratories. However, this is not the case for solar photon sputtering. Current theories and model calculations assume that the solar photon energies are directly converted into heat which controls the vaporization of the astronomical material. Mass loss due to sputtering has not been included since the required data are not available. The experiments performed by Drs. Wu and Judge should supply those data.

这些研究人员的目标是在实验室中研究从真空紫外到极紫外波长区域的分子水冰的太阳光子溅射。冰的温度将被选择来模拟真实的行星条件。在彗星、小行星、冰行星、卫星、环和星际尘埃颗粒等天文环境中，天文物质表面的原子和分子溅射是质量传递和进化的重要过程。溅射的激发源有太阳光子、太阳风、磁层粒子和微陨石。高能离子溅射的实验已经在几个实验室进行了。然而，这不是太阳光子溅射的情况。目前的理论和模型计算假设太阳光子能量直接转化为控制天文物质汽化的热量。由于没有必要的数据，因此没有包括溅射造成的质量损失。博士们所做的实验。吴和贾奇应该提供这些数据。