Low Energy Bending Modes of Small Carbon Clusters: Laboratory Terahertz Spectroscopy
小碳团簇的低能弯曲模式:实验室太赫兹光谱
基本信息
- 批准号:5364118
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2002
- 资助国家:德国
- 起止时间:2001-12-31 至 2009-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The aim of the research proposed here within the framework of Associated European Laboratory-HiRes, is to extend and expand our present studies to a new domain of postulated interstellar molecules that have so far eluded laboratory detection and thus spectroscopic scrutiny. Amongst these are molecular ions, linear chain molecules and large monocyclic and polycyclic rings. The key innovation will be the construction of an extremely sensitive but "portable" THz spectrometer working with and probing the molecular beam produced by our laser ablation technique. By simultaneously monitoring the IR spectra by tunable diode laser spectroscopy (IR-TDL) and recording the THz spectrum, we expect that this new, highly sophisticated piece of instrumentation to be considerably more sensitive in selecting the wanted spectra than our current spectrometer, particularly when used together with a mass-selective spectrometer. The THz spectrometer in its present form is already the most powerful and only tool in the world for this kind of research we do at these frequencies. Laboratory detection of large organic molecules will be valuable in several ways. Astronomical observations of such species will improve our understanding of the physical and chemical conditions in dark and dense molecular clouds and circumstellar envelopes of carbon-rich stars. These studies also will provide unique information about the synthetic steps in the rich transition region from linear to planar and cyclic structures, data needed to test theories of carbon molecular self-assembly, including fullerene formation. And lastly, the proposed program is being directed towards a major, long standing and unsolved problem in astrophysics: the identification of the carriers (i.e. atomic or molecular species) which give rise to diffuse interstellar bands (DIbs). The carriers, now generally thought to be fairly large molecules, most likely long carbon chain containing species, are important because they may constitute by mass a significant fraction of all the chemically bonded matter in nature. Over the past few months we have worked out essentially all details of the design of the new TZz spectrometer and its successful attachment to the existing TDL laser ablation molecular jet spectrometer, relying on the simultaneous measurement of THz and IR spectra. We expect that this next generation laboratory spectrometer will be well adapted to the measurement of the bending motion or ring puckering of even larger known molecules. By extension we hope that the laboratory spectra of postulated even larger interstellar molecules can be detected with it.
在欧洲联合实验室雇用的框架内提出的这项研究的目的,是将我们目前的研究扩展到一个新的假想的星际分子领域,到目前为止,这些假想的星际分子尚未被实验室检测到,因此无法进行光谱检查。其中包括分子离子、线性链分子和大的单环和多环。关键的创新将是建造一个非常敏感但“便携式”太赫兹光谱仪,用于探测我们的激光烧蚀技术产生的分子束。通过可调谐二极管激光光谱(IR- tdl)同时监测红外光谱并记录太赫兹光谱,我们期望这种新的、高度复杂的仪器在选择所需光谱方面比我们现有的光谱仪要灵敏得多,特别是当与质量选择光谱仪一起使用时。太赫兹光谱仪目前的形式已经是世界上最强大的,也是唯一的工具,用于我们在这些频率上进行的这种研究。大型有机分子的实验室检测在几个方面是有价值的。对这些物种的天文观测将提高我们对黑暗而密集的分子云和富含碳的恒星的星周包层的物理和化学条件的理解。这些研究还将提供从线性到平面和循环结构丰富过渡区的合成步骤的独特信息,以及测试碳分子自组装理论所需的数据,包括富勒烯的形成。最后,提出的计划是针对天体物理学中一个主要的、长期存在的、尚未解决的问题:确定产生漫射星际带(DIbs)的载体(即原子或分子物种)。载体,现在通常被认为是相当大的分子,最有可能是含有长碳链的物种,是重要的,因为它们可能在质量上构成了自然界中所有化学结合物质的很大一部分。在过去的几个月里,我们基本上已经完成了新tz光谱仪设计的所有细节,并成功地连接到现有的TDL激光烧蚀分子射流光谱仪,依靠同时测量太赫兹和红外光谱。我们期望下一代实验室光谱仪能够很好地适应于测量更大的已知分子的弯曲运动或环褶皱。通过扩展,我们希望可以用它来检测假设的更大的星际分子的实验室光谱。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Professor Dr. Thomas Giesen其他文献
Professor Dr. Thomas Giesen的其他文献
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{{ truncateString('Professor Dr. Thomas Giesen', 18)}}的其他基金
Internal molecular dynamics, internal rotation, high resolution spectroscopy
内分子动力学、内旋转、高分辨率光谱
- 批准号:
196959415 - 财政年份:2011
- 资助金额:
-- - 项目类别:
Research Grants
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