High resolution laser spectroscopy of small gas-phase metal-containing molecules

气相含金属小分子的高分辨率激光光谱

• 批准号: RGPIN-2016-03980
• 负责人: Adam, Allan
• 金额: $ 2.19万
• 依托单位: University of New Brunswick
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=643429
• 关键词: resolution; laser; spectroscopy; small; gas

The research program is geared towards understanding the fundamental structure and properties of small, gas-phase, metal-ligand molecules using laser spectroscopy. The molecules are produced by various methods and excited with a laser to higher energy states from which they can decay back to lower energy levels by emitting light. By detecting either this emitted light or observing at which energy the molecules absorb the radiation, a detailed understanding of the bonding, structure and interactions in the molecules can be gained. This information is important, for example, in understanding both the chemical and physical processes occurring in the atmosphere, in space, and in any surface chemistry or catalytic process.***The primary experimental technique used produces molecules in cold molecular beams (well defined streams of molecules) to give highly resolved and simplified spectra. In the experiments, a high power laser is focussed onto a metal target held in front of a pulsed gas nozzle. Vaporized atoms from the target react with reagent molecules mixed in the inert gas flowing from the nozzle. The gases then expand through a small hole into a vacuum system creating the beam. The molecules are probed downstream with a high resolution tunable laser and molecular absorptions are observed as a function of frequency.***Two groups of molecules are targeted in the research: A) diatomic metal-containing species (DMCs), and B) small metal-containing polyatomics (MCPs). We will measure a number of DMCs (e.g. RuF, RuP, RuH), where absorptions for these molecules will be observed for the first time, to comprehensively study the bonding characteristics and provide spectral information for certain molecules of catalytic and astrophysical interest. We are interested in MCPs which have astrophysical importance or are important for understanding catalysis and chemisorptions. We have recently studied MgCCH/C4H, CaCCH/CCD, Ca/SrOCH3, and will search for new molecules of this type starting with MgOCH3, SiCCH, AlCCH and FeCCH. Another MCP species of importance are metal monocarbonyls. Few gas-phase studies of these molecules, which are important in surface chemistry and catalytic reactions, exist. We will examine these MCPs for the first time to provide new information on their properties.***It is anticipated that a minimum of ten undergraduate students and four graduate students will be trained as HQP in this research program over the next five years. Technical and group training will provide each student with valuable and versatile experiences that will prepare them to take up professional positions in universities, research institutes, government agencies, and industry.

该研究计划旨在利用激光光谱学了解小的气相金属配体分子的基本结构和性质。这些分子通过各种方法产生，并用激光激发到更高的能量状态，然后通过发光衰减回较低的能级。通过检测这种发射的光或观察分子吸收辐射的能量，可以详细了解分子中的键合，结构和相互作用。例如，这一信息对于了解大气层、空间以及任何表面化学或催化过程中发生的化学和物理过程都很重要。所使用的主要实验技术在冷分子束中产生分子（定义明确的分子流），以提供高度解析和简化的光谱。在实验中，一个高功率激光聚焦到一个金属靶上举行的脉冲气体喷嘴前。来自靶的汽化原子与混合在从喷嘴流出的惰性气体中的试剂分子反应。然后，气体通过一个小孔膨胀到真空系统中，产生光束。用高分辨率可调谐激光器探测下游分子，并观察到作为频率函数的分子反射。研究中针对两组分子：A）含双原子金属的物质（DMC）和B）含小金属的多原子（MCP）。我们将测量一些DMC（如RuF，RuP，RuH），其中这些分子的吸收将首次被观察到，以全面研究成键特性，并为某些催化和天体物理学感兴趣的分子提供光谱信息。我们对具有天体物理学重要性或对理解催化和化学吸附重要的MCP感兴趣。我们最近研究了MgCCH/C4 H，CaCCH/CCD，Ca/SrOCH 3，并将从MgOCH 3，SiCCH，AlCCH和FeCCH开始寻找这种类型的新分子。另一种重要的MCP物质是金属单羰基化合物。这些分子在表面化学和催化反应中很重要，但很少有气相研究。我们将首次检查这些MCP，以提供有关其属性的新信息。*预计在未来五年内，至少有十名本科生和四名研究生将在本研究计划中接受HQP培训。技术和小组培训将为每个学生提供宝贵的和多方面的经验，这将使他们准备在大学，研究机构，政府机构和行业的专业职位。