相关实验视频
Updated: Jul 9, 2026
08:56
Visual Detection of Multiple Nucleic Acids in a Capillary Array
Published on: November 15, 2017
使用磁光陷进行超敏感的同位素痕迹分析
1Physics Division, and Chemistry Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA.
Science (New York, N.Y.)
|November 5, 1999
概括
激光操纵精确计数天然气中的罕见同位素. 这种先进的同位素微量分析提供了高灵敏度,并避免了各种应用的污染.
科学领域:
- 原子物理 原子物理
- 分析化学 分析化学
- 同位素比重质谱法 质谱法 质谱法
背景情况:
- 精确量化稀有同位素对于各种科学和工业应用至关重要.
- 传统的同位素痕迹分析方法可能受到灵敏度和潜在污染问题的限制.
研究的目的:
- 用激光操纵演示一种用于计算特定同位素的单个原子的新方法.
- 评估这种技术对-85和-81的超微量同位素分析的可行性.
主要方法:
- 使用激光操纵技术来隔离和计数单个中性原子.
- 分析天然气样本以确定同位素丰度.
- 测量激光操纵系统的检测效率.
主要成果:
- 成功计数了个别的-85和-81原子,其丰度分别低至10~11和10~13).
- 显示检测效率为1 x 10 (-7).
- 该方法被证明没有受到其他同位素和元素的污染.
结论:
- 激光操纵为同位素痕迹分析提供了高度敏感和选择性的方法.
- 该技术对各种同位素标记物和应用具有广泛的应用.
- 通过系统改进,有可能显著提高检测效率.
相关概念视频
01:13Mass Analyzers: Overview
The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
01:19Mass Analyzers: Common Types
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...