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.

该研究计划旨在了解使用激光光谱法的小型气相，金属配体分子的基本结构和特性。这些分子是通过各种方法产生的，并用激光激发到更高的能量状态，它们可以通过发光降低到较低的能量水平。通过检测这种发出的光或观察分子吸收辐射的能量，可以获得对分子中键合，结构和相互作用的详细理解。例如，在理解大气中，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很重要。在实验中，高功率激光器聚焦在脉冲气喷嘴前保持的金属靶标上。来自靶的蒸发原子与从喷嘴流动的惰性气体中混合的试剂分子反应。然后，气体通过一个小孔扩展到产生光束的真空系统中。将分子在下游探测高分辨率可调激光，并观察到分子吸收是频率的函数。我们将测量许多DMC（例如RUF，RUP，RUH），其中将首次观察到这些分子的吸收，以全面研究键合特性并为催化和天体物理学兴趣的某些分子提供光谱信息。我们对具有天体物理重要性的MCP感兴趣，或者对于理解催化和化学故障很重要。我们最近研究了MGCCH/C4H，CACCH/CCD，CA/SROCH3，并将以Mgoch3，Sicch，Alcch和Fecch开头搜索这种类型的新分子。另一种重要的MCP是金属单核子。这些分子对表面化学和催化反应很重要的这些分子的气相研究存在。我们将首次研究这些MCP，以提供有关其物业的新信息。技术和小组培训将为每个学生提供宝贵而多功能的经验，这将使他们准备在大学，研究机构，政府机构和行业中担任专业职位。