Development of an ion guide device in orthogonal acceleration time-of-flight mass spectrometer coupled with laser resonance ionization source

Abstract

Laser-resonance-ionization time-of-flight mass spectrometer (LRI-TOF-MS) has been widely used in the analysis of trace isotopes because of its advantages such as high isotope selectivity, high sensitivity, and capability to receive all isotopes in a single measurement. A LRI-TOF-MS was built in our laboratory to search for efficient laser resonance ionization scheme of some elements and analyse their isotopic composition. To improve the resolution and suppress the peak tail, the orthogonal-acceleration technology was used in LRI-TOF-MS for the first time, and the design method of electrical parameters of TOF mass analyser with dual-stage reflectrons was derived. The developed ion guide device consisted of several different electrostatic lenses and was manufactured through theoretical analysis, SIMION simulation and experimental evaluation. The results show that the LRI source and the TOF mass analyser matched well in performance.