A Simple High-Flux Switchable VUV Lamp Based on an Electrodeless Fluorescent Lamp for SPI/PAI Mass Spectrometry,Analytical Chemistry

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A Simple High-Flux Switchable VUV Lamp Based on an Electrodeless Fluorescent Lamp for SPI/PAI Mass Spectrometry
Analytical Chemistry ( IF 6.7 ) Pub Date : 2023-07-20 , DOI: 10.1021/acs.analchem.3c01021
Zitao Yan _{1,

2} , Lixin Shan _{1,

2} , Shiyu Cheng _{1,

2} , Zhangqi Yu _{1,

2} , Zhiyang Wei _{1,

2} , Haijie Wang _{1,

2} , Haohang Sun _{1,

2} , Bo Yang _{1,

2} , Jinian Shu _{1,

2} , Zhen Li _{1,

2}

Affiliation

Single-photon ionization (SPI) is a unique soft ionization technique for organic analysis. A convenient high-flux vacuum ultraviolet (VUV) light source is a key precondition for wide application of SPI techniques. In this study, we present a novel VUV lamp by simply modifying an ordinary electrodeless fluorescent lamp. By replacing the glass bulb with a stainless steel bulb and introducing 5% Kr/He (v/v) as the excitation gas, an excellent VUV photon flux over 4.0 × 10¹⁴ photons s^–1 was obtained. Due to its rapid glow characteristics, the VUV lamp can be switched on and off instantly as required by detection, ensuring the stability and service life of the lamp. To demonstrate the performance of the new lamp, the switchable VUV lamp was coupled with an SPI-mass spectrometer, which could be changed to photoinduced associative ionization (PAI) mode by doping gaseous CH₂Cl₂ to initiate an associative ionization reaction. Two types of volatile organic compounds sensitive to SPI and PAI, typically benzene series and oxygenated organics, respectively, were selected as samples. The instrument exhibited a high detection sensitivity for the tested compounds. With a measurement time of 11 s, the 3σ limits of detection ranged from 0.33 to 0.75 pptv in SPI mode and from 0.03 to 0.12 pptv in PAI mode. This study provides an extremely simple method to assemble a VUV lamp with many merits, e.g., portability, robustness, durability, low cost, and high flux. The VUV lamp may contribute to the development of SPI-related highly sensitive detection technologies.

中文翻译：

基于无电极荧光灯的简单高通量可切换 VUV 灯，用于 SPI/PAI 质谱分析

单光子电离 (SPI) 是一种独特的有机分析软电离技术。方便的高通量真空紫外（VUV）光源是SPI技术广泛应用的关键前提。在这项研究中，我们通过简单地改造普通无电极荧光灯，提出了一种新型 VUV 灯。通过用不锈钢灯泡代替玻璃灯泡并引入 5% Kr/He (v/v) 作为激发气体，获得了超过 4.0 × 10 ¹⁴光子 s ^–1的优异 VUV 光子通量。由于其快速发光的特性，VUV灯可以根据检测的需要即时打开和关闭，保证了灯的稳定性和使用寿命。_{为了展示新灯的性能，可切换的 VUV 灯与 SPI 质谱仪耦合，通过掺杂气态 CH 2} Cl ₂来引发缔合电离反应，可将其更改为光致缔合电离 (PAI) 模式。选择对 SPI 和 PAI 敏感的两类挥发性有机化合物（典型的分别是苯系物和含氧有机物）作为样品。该仪器对测试化合物表现出较高的检测灵敏度。测量时间为 11 s，SPI 模式下 3σ 检测限为 0.33 至 0.75 pptv，PAI 模式下为 0.03 至 0.12 pptv。这项研究提供了一种极其简单的方法来组装 VUV 灯，具有许多优点，例如便携性、坚固性、耐用性、低成本和高通量。VUV灯可能有助于SPI相关高灵敏度检测技术的发展。

更新日期：2023-07-20

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