Evolved Gas Analysis Using Photoionization Mass Spectrometry

Abstract

Photoionization (PI) with vacuum ultraviolet (VUV) light provides an e$cient and fragmentation-free method for the soft ionization of gaseous compounds. A photoionization source with a deuterium (D 2 ) lamp for PI was installed in a vacuum chamber in the ionization chamber of a mass spectrometer. The PI mass spectrometry (PIMS) was applied to the evolved gas analysis (EGA) system for the volatilization of organic solvents and thermal decomposition of polymers in an inert gas atmosphere. The PI mass spectrum obtained was satisfactorily characterized by only the parent ions with no contribution as a result of fragmentation during ionization. The results suggested that EGA-PIMS was an especially powerful and desirable in situ thermal analysis method for substances which evolve organic gases simultaneously and sequentially. The combination of a VUV-light source with a quadropole-mass spectrometer in EGA is described briefly, and the results compared with EGA using conventional electron impact ionization mass spectrometry are presented.

Absolute photoionization cross sections of furanic fuels: 2‐ethylfuran, 2‐acetylfuran and furfural

“…who used the electron‐impact ionization (EI) technique. Arii et al . explain in their work the differences between using the electron ionization technique and the photoionization with vacuum ultraviolet light technique when performing an evolved gas analysis.…”

“…Photoionization is a technique that is considered to be both a selective and soft (fragment‐free) technique, controlling fragmentation at the time of photoionization. It was concluded by Arii et al . that the use of the more sensitive and precise PIMS greatly reduced fragmentation of the compounds being studied when compared with the conventional EI mass spectrometry.…”

“…that the use of the more sensitive and precise PIMS greatly reduced fragmentation of the compounds being studied when compared with the conventional EI mass spectrometry. The issues identified by Arri et al . could have impacted the results obtained by Linda et al ., helping to explain the discontinuity in the results presented in this study and those by Klapstein et al …”

“…However, our experimental value does not agree well with the literature value of 9.27 ± 0.05 eV obtained by Linda et al [37] who used the electron-impact ionization (EI) technique. Arii et al [45] explain in their work the differences between using the electron ionization technique and the photoionization with vacuum ultraviolet light technique when performing an evolved gas analysis. For the qualitative analysis of complex organic compounds, EI can increase the difficulty of the analysis due to the formation of fragment ions.…”

Evolved Gas Analysis Using Photoionization Mass Spectrometry, EGA-PIMS: Characterization of Pyrolysis Products from Polymers

“…T. Arii, K. Motomura, and S. Otake ῌ 6 ῌ and 160 nm, respectively; the narrow intense Lyman a atomic line was at 121.567 nm. 21) Ionization was accomplished by photoionization at 10.2 eV.…”