PuSH - Publication Server of Helmholtz Zentrum München: Atmospheric pressure single photon laser ionization (APSPLI) mass spectrometry using a 157 nm fluorine excimer laser for sensitive and selective detection of non- to semipolar hydrocarbons.

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Rüger, C.P.* ; Neumann, A.* ; Sklorz, M. ; Zimmermann, R.

Atmospheric pressure single photon laser ionization (APSPLI) mass spectrometry using a 157 nm fluorine excimer laser for sensitive and selective detection of non- to semipolar hydrocarbons.

Anal. Chem. 93, 3691-3697 (2021)

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Atmospheric pressure single photon ionization (APSPLI) mass spectrometry utilizing a fluorine excimer laser (157 nm, 7.9 eV) is presented for the first time. For evaluation and optimization, polycyclic aromatic hydrocarbon (PAH) standard mixtures were used. The presented technique allowed for the selective ionization of semi- to nonpolar compounds in a single photon ionization process using VUV photons. Molecular radical cations were found as a base peak, whereas protonated species were almost absent. Although the ionization chamber is flushed by pure nitrogen, remaining oxygen and water traces caused unwanted oxidized ionization artifacts. Installation of water and oxygen filter cartridges significantly reduced the abundance of artifacts. For evaluating complex mixture analysis, APSPLI was applied to characterize a light crude oil. In addition to aromatic hydrocarbons, APSPLI allowed for the sensitive ionization of sulfur-containing aromatic constituents (PASH). A comparison of APSPLI to atmospheric pressure laser ionization (266 nm, 4.7 eV) revealed the additional compositional space accessible by the single photon process. APLI, conducted with UV radiation, is mainly restricted to PAH analysis. APSPLI overcomes this limitation, and PAH and PASH, which often occur simultaneously in complex mixtures, can be detected. This novel ionization concept is envisioned to have a high analytical potential further explored in the future.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

ISSN (print) / ISBN 0003-2700

e-ISSN 1520-6882

Journal Analytical Chemistry

Quellenangaben Volume: 93, Issue: 8, Pages: 3691-3697

Publisher American Chemical Society (ACS)

Publishing Place 1155 16th St, Nw, Washington, Dc 20036 Usa

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Cooperation Group Comprehensive Molecular Analytics (CMA)

Grants German Research Foundation (DFG)
Horizon 2020 program for the EU FT-ICR MS project (European Network of Fourier-Transform Ion-Cyclotron-Resonance Mass Spectrometry Centers)