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.

本项目致力于研究液氦纳米液滴在极低温度（T = 0.37 K）下的天体化学相关反应。这些液滴是由氦气通过冷却喷嘴超音速膨胀产生的，并以“分子束”的形式引导。通过让光束穿过各个拾取单元或使其与流出物交叉，反应伙伴沉积在氦纳米液滴上或内部。有几种方法可用于监测反应的发生：质谱法、化学发光检测、耗尽技术和激光光谱法。通过测量反应前后的氦液滴的尺寸来获得有关反应焓的信息。将使用质谱和激光光谱来表征反应产物，研究重点是金属原子 Si、Al、Fe 之间的中性-中性反应。将研究碳氢化合物前体的热解离产生碳氢化合物自由基。此外，还将研究这些自由基与金属原子和多环芳烃分子的反应。来自烃基。

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.

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

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