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  Gas-phase chemistry in the GC Orbitrap Mass Spectrometer

Baumeister, T. U. H., Ueberschaar, N., & Pohnert, G. (2019). Gas-phase chemistry in the GC Orbitrap Mass Spectrometer. Journal of the American Society for Mass Spectrometry, 30(4), 573-580. doi:10.1007/s13361-018-2117-5.

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Baumeister, Tim U. H.1, Author              
Ueberschaar, Nico, Author
Pohnert, Georg1, Author              
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1Max Planck Fellow Group Chemical Ecology of Plankton, Prof. Georg Pohnert, MPI for Chemical Ecology, Max Planck Society, ou_2333692              

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 Abstract: Gas-phase reactions of temporally stored ions play a significant role in trapped ion mass spectrometry. Especially highly labile ion species generated through electron ionization (EI) are prone to undergo gas-phase reactions after relaxation to a low vibrational state. Here, we show that in the C-Trap of the Q Exactive GC Orbitrap mass spectrometer, gaseous water reacts with radical cations of various compound classes. High-resolution accurate mass spectrometry of the resulting ions provides a key to the mechanistic understanding of the chemistry of high energetic species generated during EI. We systematically addressed water adduct formation by use of H2O and D2 18O in the C-Trap. Mass spectra of halogen cyanides XCN (X=Cl, Br, I) showed the formation of HXCN+ species, indicating hydrogen atomic transfer reactions. Relative ratios of HXCN+/XCN+• increased as the electronegativity of the halide increased. The common internal calibrant perfluorotributylamine forms oxygenated products from water reactive fragment ions. These can be explained by the addition of water to an initial cation followed by elimination of two HFmolecules. This addition/elimination chemistry can also explain [M+2]+ and [M+3]+ ions that commonly occur in mass spectra of silylated analytes. High-resolution accurate mass spectra of trimethylsilyl (TMS) derivatives revealed these as [M−CH3 •+H2O]+ and [M−CH4+H2O]•+, respectively. This study explains common fragment ions in ion trap mass spectrometry. It also opens up perspectives for the systematic mechanistic and kinetic investigation of high-energy ion reactivity.

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 Dates: 2018-11-262018-12-192019
 Publication Status: Published in print
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 Identifiers: Other: FGP007
DOI: 10.1007/s13361-018-2117-5
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Title: Journal of the American Society for Mass Spectrometry
Source Genre: Journal
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Publ. Info: New York, NY : Springer
Pages: - Volume / Issue: 30 (4) Sequence Number: - Start / End Page: 573 - 580 Identifier: ISSN: 1044-0305
CoNE: https://pure.mpg.de/cone/journals/resource/954925590403