Ultra-low temperature hydrocarbon chemistry in liquid helium droplets

液氦液滴中的超低温碳氢化合物化学

• 批准号: 58774912
• 负责人: Professor Dr. Friedrich Huisken
• 金额: --
• 依托单位: Laboratory Astrophysics and Cluster Physics Group
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/58774912?language=en
• 关键词: Ultra; low; temperature; hydrocarbon; chemistry

The present project is devoted to the study of astrochemically relevant reactions at extremely low temperature (T = 0.37 K) as provided by liquid helium nanodroplets. The droplets are produced by supersonic expansion of helium gas through a cooled nozzle and directed as a “molecular beam” into a mass spectrometer detector. The reaction partners are deposited on or into the helium nanodroplets by letting the beam pass through individual pick-up cells or letting it cross with effusive beams. Several methods are applied to monitor the occurrence of reaction: Mass spectrometry, chemiluminescence detection, depletion technique, and laser spectroscopy. Information about the enthalpy of the reaction is obtained by measuring the size of the helium droplets before and after the reaction. To characterize the reaction products, mass spectrometry and laser spectroscopy will be used. The studies will focus on neu- tral-neutral reactions of astrochemical interest. Reactions between metal atoms Si, Al, Fe, and Mg with hydrocarbons will be studied. Hydrocarbon radicals will be produced by thermal dissociation of the precursor hydrocarbon gas. Reactions of these radicals with metal atoms and PAHs molecules will be studied. Also, attention will be given to the formation of large hydrocarbon molecules starting from the hydrocarbon radicals.

本项目致力于研究由液氦纳米光提供的极低温度（t = 0.37 K）的星体相关反应。液滴是通过冷却喷嘴的超音速膨胀产生的，并将其定向到质谱仪检测器中。反应伴侣通过让束穿过单个拾音器或让其与废水梁交叉，将反应伴侣沉积在氦纳米圆形上。应用了几种方法来监测反应的发生：质谱，化学发光检测，部署技术和激光光谱法。有关反应焓的信息是通过测量反应前后氦液滴的大小来获得的。为了表征反应产物，将使用质谱和激光光谱法。这些研究将集中于天体化学兴趣的神经中性反应。金属原子Si，Al，Fe和Mg与烃之间的反应将研究。碳氢化合物自由基将通过前体碳氢化合物气体的热解离产生。这些自由基与金属原子和PAHS分子的反应将研究。同样，将注意从碳氢化合物自由基开始的大烃分子的形成。

项目成果

Reactivity of iron atoms at low temperature.

铁原子在低温下的反应性

• DOI: 10.1021/jp5007704
• 发表时间: 2014
• 期刊: The journal of physical chemistry. A
• 作者: S. A. Krasnokutski;F. Huisken
• 通讯作者: F. Huisken

A simple and clean source of low-energy atomic carbon

• DOI: 10.1063/1.4895806
• 发表时间: 2014-09-15
• 期刊: APPLIED PHYSICS LETTERS
• 影响因子: 4
• 作者: Krasnokutski, S. A.;Huisken, F.
• 通讯作者: Huisken, F.

Resonant two-photon ionization spectroscopy of Al atoms and dimers solvated in helium nanodroplets.

氦纳米液滴中溶剂化的铝原子和二聚体的共振双光子电离光谱

• DOI: 10.1063/1.4908533
• 发表时间: 2015
• 期刊: The Journal of chemical physics
• 作者: S. A. Krasnokutski;F. Huisken
• 通讯作者: F. Huisken

Ultra-low-temperature reactions of C(³P₀) atoms with benzene molecules in helium droplets.

C(³Pâ)原子与苯分子在氦液滴中的超低温反应

• DOI: 10.1063/1.4902369
• 发表时间: 2014
• 期刊: The Journal of chemical physics
• 作者: . A. Krasnokutski;F. Huisken
• 通讯作者: F. Huisken