A Miniaturized Linear Wire Ion Trap with Electron Ionization and Single Photon Ionization Sources

作者：Wu Qinghao; Tian Yuan; Li Ailin; Andrews Derek; Hawkins Aaron R; Austin Daniel E^*

来源：Journal of the American Society for Mass Spectrometry, 2017, 28(5): 859-865.

DOI：10.1007/s13361-017-1607-1

• Linear ion trap
• Wire electrodes
• Vacuum UV ionization
• Miniaturized ion trap

A linear wire ion trap (LWIT) with both electron ionization (EI) and single photon ionization (SPI) sources was built. The SPI was provided by a vacuum ultraviolet (VUV) lamp with the ability to softly ionize organic compounds. The VUV lamp was driven by a pulse amplifier, which was controlled by a pulse generator, to avoid the detection of photons during ion detection. Sample gas was introduced through a leak valve, and the pressure in the system is shown to affect the signal-to-noise ratio and resolving power. Under optimized conditions, the limit of detection (LOD) for benzene was 80 ppbv using SPI, better than the LOD using EI (137 ppbv). System performance was demonstrated by distinguishing compounds in different classes from gasoline.

• 出版日期2017-5