Resonance ionization mass spectroscopy

共振电离质谱

• 批准号: 386343-2011
• 负责人: Lassen, Jens
• 金额: $ 1.46万
• 依托单位: TRIUMF
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572941
• 关键词: Resonance; ionization; mass; spectroscopy

Laser Resonance Ionization Mass Spectrometry (RIMS) is a modern technique, which finds most of its practical applications in environmental, laser isotope separation or elemental ultra-trace analysis. RIMS excites the valence electron of an atom through several energy levels until it is stripped. The atom thus turns into a charged particle, which is easily be manipulated by electric fields. The power of the RIMS technique stems from the element selectivity of resonant laser excitation combined with the mass selectivity of modern separators. As a result a highly selective, yet highly sensitive instrument is at hand - exactly what is needed to investigate and selectively extract the minute quantities of short-lived, rare-isotopes produced at TRIUMF's Isotope Separator and Accelerator ISAC facility. At ISAC, higher ionization efficiency and higher selectivity transpire directly into shorter, yet more precise measurements of nuclear parameters. These nuclear quantities are the window into the world of subatomic physics. The RIMS program trains graduate students in high-resolution and precision laser spectroscopy techniques, along with nuclear physics expertise. Effective laser excitation schemes are to be developed for at least 10 elements that so far have not been accessible or required high powered, un-specific laser sources for ionization. This can be achieved by investigating the mostly uncharted auto-ionizing (AI) atomic states by resonance ionization spectroscopy. The AI greatly reduce the laser power required for ionization and add another unique excitation step ionization scheme. For many elements an order of magnitude improvement in ionization efficiency is expected. The first element to be investigated will be Astatine - the rarest of all elements on earth, yet, it is produced at ISAC. A successful development of laser excitation schemes will keep Canada's National Laboratory for Nuclear and Particle Physics: TRIUMF in the lead by providing the most intense and most exotic rare isotope beams available. This will attract the best groups world wide in nuclear and particle physics to continue to come to Vancouver in their quest for answers on the inner makings of matter.

激光共振电离质谱（RIMS）是一种现代化技术，在环境、激光同位素分离和元素超痕量分析等方面有着广泛的应用。RIMS通过几个能级激发原子的价电子，直到它被剥离。这样，原子就变成了带电粒子，很容易被电场操纵。 RIMS技术的力量源于共振激光激发的元素选择性与现代分离器的质量选择性相结合。因此，一台高选择性、高灵敏度的仪器就在眼前--正是研究和选择性提取TRIUMF同位素分离器和加速器ISAC设施生产的微量短寿命稀有同位素所需的仪器。在ISAC，更高的电离效率和更高的选择性直接转化为更短，但更精确的核参数测量。这些核量是了解亚原子物理学世界的窗口。 RIMS计划培养研究生高分辨率和精密激光光谱技术，沿着核物理专业知识。将为至少10种元素制定有效的激光激发方案，这些元素迄今尚无法获得或需要高功率、非特定激光源进行电离。这可以通过共振电离光谱研究大多数未知的自电离（AI）原子态来实现。AI大大降低了电离所需的激光功率，并增加了另一种独特的激发步骤电离方案。对于许多元素，电离效率有望提高一个数量级。 第一个被调查的元素将是Astatine -地球上最稀有的元素，然而，它是在ISAC生产的。激光激发方案的成功开发将使加拿大国家核与粒子物理实验室：TRIUMF通过提供最强和最奇异的稀有同位素束保持领先地位。这将吸引世界上最好的团体在核和粒子物理继续来到温哥华，在他们的追求答案的内部构成的问题。