High resolution microwave spectroscopy

高分辨率微波光谱

• 批准号: 4566-2006
• 负责人: Gerry, Michael
• 金额: $ 0.73万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=336236
• 关键词: resolution; microwave; spectroscopy

This research uses the speeds of rotation of gaseous molecules to determine their geometries.  The method used is analogous to ringing a bell, in which a clapper hits the bell, which then rings at tones (frequencies) characteristic of its shape, size and composition.  In our research the clapper is replaced by a pulse of microwaves which gives the molecules extra energy.  As the molecules lose this energy they emit microwave radiation at characteristic frequencies dictated also by their shape, size and composition.  We use the patterns of the frequencies (the spectrum) to determine the molecular geometries.  Furthermore, we can measure the frequencies so precisely that we can (and do) use small variations from the basic patterns to determine how flexible the molecules are, as well as to obtain information on how the electrons in the molecules (the glue holding the molecule together) are arranged. We are studying small molecules containing metals.  They are prepared by vaporizing solid metal with a laser, and allowing the vapour to react with another substance contained in a noble gas (e.g. argon).  The resulting mixture is then injected as a jet into an evacuated cell.  This procedure holds the molecules long enough for them to be studied. Some specific compounds we are studying are those in which noble gases attach themselves to metals so strongly that the bonding can be considered chemical bonding!  In other work we assess how meaningful physically some of our very precise parameters, particularly bond lengths, really are.

这项研究利用气体分子的旋转速度来确定它们的几何形状。所用的方法类似于敲钟，在敲钟过程中，一个人敲击钟，钟就会发出音调（频率）其形状的特征，在我们的研究中，微波脉冲取代了微波，给分子提供了额外的能量，当分子失去能量时，它们会发出微波辐射的特征频率也取决于它们的形状，大小和成分。我们使用频率的模式此外，我们可以精确地测量频率，以至于我们可以（并且确实）使用基本模式的微小变化来确定分子的灵活性，以及获得分子中电子（将分子粘合在一起的胶水）如何排列的信息。我们正在研究含金属的小分子。它们是通过用激光蒸发固体金属，并使蒸汽与惰性气体（例如氩气）中所含的另一种物质反应而制备的。然后将所得混合物作为射流注入抽空的细胞中。这一过程使分子保持足够长的时间以供研究。我们正在研究的一些特定化合物是稀有气体与金属的结合如此强烈，以至于这种结合可以被认为是化学键合！ 在其他工作中，我们评估了一些非常精确的参数，特别是键长，在物理上的意义。