| Title: | A Simple High-Flux Switchable VUV Lamp Based on an Electrodeless Fluorescent Lamp for SPI/PAI Mass Spectrometry |
| Author(s): | Yan Z; Shan L; Cheng S; Yu Z; Wei Z; Wang H; Sun H; Yang B; Shu J; Li Z; |
| Address: | "Research Center for Environmental Material and Pollution Control Technology, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China. National Engineering Laboratory for VOCs Pollution Control Material & Technology, Beijing 101408, People's Republic of China" |
| DOI: | 10.1021/acs.analchem.3c01021 |
| ISSN/ISBN: | 1520-6882 (Electronic) 0003-2700 (Linking) |
| Abstract: | "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 x 10(14) 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 CH(2)Cl(2) 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 3sigma 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" |
| Notes: | "PubMed-not-MEDLINEYan, Zitao Shan, Lixin Cheng, Shiyu Yu, Zhangqi Wei, Zhiyang Wang, Haijie Sun, Haohang Yang, Bo Shu, Jinian Li, Zhen eng 2023/07/21 Anal Chem. 2023 Aug 15; 95(32):11859-11867. doi: 10.1021/acs.analchem.3c01021. Epub 2023 Jul 20" |
