相关实验视频
Updated: Mar 12, 2026

10:42
Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
7.4K
为高分辨率电荷检测质谱仪使用放射细分离子镜的优化.
David W Reitenbach1, Martin F Jarrold1
1Chemistry Department, Indiana University, 800 E Kirkwood Ave, Bloomington, Indiana 47405, United States.
Journal of the American Society for Mass Spectrometry
|March 10, 2026
概括
电荷检测质谱 (CD-MS) 使用静电线性离子陷 (ELIT) 来进行质量测量. 细分ELIT电极允许修剪潜力纠正错位,改善异质样本的质量分辨率.
科学领域:
- 分析化学 分析化学
- 质谱测量质量谱测量
- 仪器化 仪器化 仪器化
背景情况:
- 电荷检测质谱 (CD-MS) 测量质量与电荷比率 (m/z) 和离子的电荷状态.
- 高分辨率CD-MS受限于m/z的确定不准确性,通常是由于静电线性离子陷 (ELIT) 设计的敏感性.
- 之前的ELIT设计实现了高分辨率 (>300,000),但不能容忍制造失调 (<20微米).
研究的目的:
- 解决高分辨率ELIT设计对机械错位的不容忍问题.
- 开发一种方法来纠正ELIT中的错位,以提高质量分辨率和捕获效率.
- 使用CD-MS. 在异质样本中实现可靠的高质量测量.
主要方法:
- 分段静电线性离子陷 (ELIT) 镜子电极.
- 应用计算机控制的装饰潜力来纠正机械错位.
- 使用轨迹模拟来预测捕获效率和m/z分辨率.
主要成果:
- 模拟表明,具有修剪潜力的细分ELIT可以恢复高捕获效率 (>90%).
- 拟议的方法允许尽管存在潜在的错位,但仍然保持高的m/z分辨能力 (>200,000).
- 这种方法克服了以前的ELIT设计的局限性,因为错位导致了灾难性的陷效率损失.
结论:
- 带有trim潜力的细分ELIT电极为提高CD-MS的稳定性和性能提供了可行的解决方案.
- 这种技术可以对千兆级异质样本进行高分辨率的质量测量.
- 开发的方法通过减轻对制造缺陷的敏感性来提高CD-MS的实际适用性.
相关概念视频
Mass Analyzers: Overview
2.0K
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...
2.0K
Mass Analyzers: Common Types
1.8K
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...
1.8K
High-Resolution Mass Spectrometry (HRMS)
2.8K
The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
2.8K
Mass Spectrometers
9.8K
This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
9.8K
Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview
2.4K
In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
2.4K
Mass Spectrum: Interpretation
3.7K
An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...
3.7K

