Photoemission atomic spectroscopy of laboratory plasma in the vacuum UV region

真空紫外区实验室等离子体的光发射原子光谱

• 批准号: 2881-2006
• 负责人: Joshi, Yogi
• 金额: $ 1.3万
• 依托单位: St. Francis Xavier University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=364994
• 关键词: Photoemission; atomic; spectroscopy; laboratory; plasma

The light coming from the sun/stars/nebulae or other astronomical bodies has stored in it an immense amount of knowledge about the physical properties of these bodies.  This light is given out by the atoms and molecules present in their atmospheres, and therefore its study can provide information on elemental abundance, surface temperature, pressure, motions, magnetic field, etc.  To retrieve this information from the light (spectrum) emitted, one has to understand the behaviour of atoms/ions in the laboratory under conditions somewhat similar to those of the astronomical bodies, and then compare the laboratory and the astronomical data.  Our group in Antigonish, in collaboration with Russian, French and US research Institutes, has been engaged for over three decades in this endeavour of studying these ions in the laboratory environment and has made significant contributions to the field of Analysis of Atomic Spectra.  The data on platinum (Pt) and selenium reported by our laboratory confirmed the presence of heavy element Pt in chemically peculiar stars and selenium in planetary nebulae.  Knowledge of the structure of heavy ions, as well as, those with f-electrons, is still quite sketchy, and these are the ions we propose to investigate in the next five years.  The extended experimental data on atomic/ionic structures provided by research groups like ours are also of vital importance to theoretical atomic physicists and astrophysicists for testing/revising/extending their ionic models or stellar phenomena on these ions.

来自太阳/恒星/星云或其他天体的光储存了大量关于这些天体物理性质的知识。这些光是由存在于其大气中的原子和分子发出的，因此对它的研究可以提供元素丰度，表面温度，压力，运动，磁场，从光线中获取信息为了测量原子/离子发射的光谱，我们必须了解原子/离子在实验室中在与天体类似的条件下的行为，然后将实验室和天文数据进行比较。我们在安提戈尼什的小组与俄罗斯合作，法国和美国的研究机构，在实验室环境中研究这些离子已有三十多年，并对原子光谱分析领域作出了重大贡献。和硒的发现，证实了化学奇特恒星中存在重元素Pt，行星状星云中存在硒。这些离子是我们计划在未来五年内研究的对象，而我们的研究小组提供的有关原子/离子结构的扩展实验数据，对于理论原子物理学家和天体物理学家检验/修正/扩展他们的离子模型或有关这些离子的恒星现象也是至关重要的。