Development of lithium attachment mass spectrometry – knudsen effusion and chemical ionisation mass spectrometry (KEMS, CIMS),Analyst

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Development of lithium attachment mass spectrometry – knudsen effusion and chemical ionisation mass spectrometry (KEMS, CIMS)
Analyst ( IF 3.6 ) Pub Date : 2017-09-07 00:00:00 , DOI: 10.1039/c7an01161j
A. Murray Booth _{1,

2,

3,

4} , Thomas J. Bannan _{1,

2,

3,

4} , Med Benyezzar _{3,

4,

5} , Asan Bacak _{1,

2,

3,

4} , M. Rami Alfarra _{1,

2,

3,

4,

6} , David Topping _{1,

2,

3,

4} , Carl J. Percival _{1,

2,

3,

4}

Affiliation

Lithium ion attachment mass spectrometry provides a non-specific, non-fragmenting, sensitive and robust method for the detection of volatile species in the gas phase. The design, manufacture and results of lithium based ion attachment ionisation sources for two different mass spectrometry systems are presented. In this study trace gas analysis is investigated using a modified Chemical Ionization Mass Spectrometer (CIMS) and vapour pressure measurements are made using a modified Knudsen Effusion Mass Spectrometer (KEMS). In the Li⁺ CIMS, where the Li⁺ ionization acts a soft and unselective ionization source, limits of detection of 0.2 ppt for formic acid, 15 ppt for nitric acid and 120 ppt for ammonia were achieved, allowing for ambient measurements of such species at atmospherically relevant concentrations. In the first application of Lithium ion attachment in ultra-high vacuum (UHV), vapor pressures of various atmospherically relevant species were measured with the adapted KEMS, giving measured values equivalent to previous results from electron impact KEMS. In the Li⁺ KEMS vapour pressures <10⁻³ mbar can be measured without any fragmentation, as is seen with the initial electron impact (EI) set up, allowing the vapor pressure of individual components within mixtures to be determined.

中文翻译：

锂附着质谱仪的发展–努森渗流和化学电离质谱仪（KEMS，CIMS）

锂离子附着质谱仪为检测气相中的挥发性物质提供了一种非特异性，无碎片，灵敏且稳定的方法。介绍了两种不同质谱系统的锂基离子附着电离源的设计，制造和结果。在这项研究中，使用改良的化学电离质谱仪（CIMS）研究了痕量气体分析，并使用改良的Knudsen扩散质谱仪（KEMS）进行了蒸气压测量。在Li ⁺ CIMS中，Li ⁺电离是一种柔软的非选择性电离源，甲酸的检出限为0.2 ppt，硝酸的检出限为15 ppt，氨的检出限为120 ppt，从而可以在大气相关浓度下对此类物质进行环境测量。在锂离子附件在超高真空（UHV）中的首次应用中，使用改编的KEMS测量了各种与大气有关的物质的蒸气压，得出的测量值与电子碰撞KEMS的先前结果相当。在Li ⁺ KEMS中，可以测量<10 ^-3 mbar的蒸气压而没有任何碎裂，这是通过建立初始电子冲击（EI）可以看到的，从而可以确定混合物中各个组分的蒸气压。

更新日期：2017-09-07

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