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Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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从海根斯探测器上的GCMS仪器获得泰坦大气层成分的丰度.

H B Niemann1, S K Atreya, S J Bauer

  • 1National Aeronautics and Space Administration, Greenbelt, Maryland 20771, USA. Hasso.B.Niemann@nasa.gov

Nature
|December 2, 2005
PubMed
概括

来自海根斯探测器的直接测量证实了泰坦.

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科学领域:

  • 行星科学:探索土星最大的卫星,泰坦.

背景情况:

  • 泰坦的大气组成和甲循环仍然不太清楚.
  • 以前的探索依赖于遥感和近距离飞行 (旅行者,卡西尼).

研究的目的:

  • 报告来自惠根斯探测器的气体染色体质谱仪 (GCMS) 的直接大气测量结果.
  • 分析成分,同位素比例和微量物种,包括有机化合物.

主要方法:

  • 从卡西尼号航天器上部署海根斯探测器.
  • 使用气体染色体质谱仪 (GCMS) 在现场进行大气测量.
  • 分析高度形状,同位素比率和微量物种.

主要成果:

  • 已确认和甲是大气的主要成分.
  • 检测到原始 (36Ar) 和放射性 (40Ar) 同位素,限制了排气历史.
  • 在地表上发现了微量有机物种,包括素和乙.

结论:

  • 惠根斯探测器提供了首次直接测量泰坦的表面和下层大气层.
  • 测量提供了对泰坦大气起源和演变的关键约束.
  • 发现微量有机物提供了对泰坦大气化学的洞察力.