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Atmospheric pressure laser ionization Mass Spectrometry with tunable UV wavelength utilizing an optical parametric oscillator.
Anal. Chem., DOI: 10.1021/acs.analchem.4c05040 (2024)
To our knowledge, this study presents the first implementation of wavelength-resolved resonance-enhanced multiphoton ionization (REMPI) spectroscopy under atmospheric pressure ionization conditions using a high-resolution mass spectrometric system. Atmospheric pressure laser ionization MS spectroscopic measurements were conducted on over 70 different polycyclic aromatic hydrocarbons (PAHs) and hetero-PAHs (N, S, and O) in standard solutions, as well as three complex PAH-containing samples. The results demonstrate the successful transfer of REMPI spectroscopy from vacuum to atmospheric pressure conditions, maintaining spectral integrity without significant band broadening. The obtained spectral data add an orthogonal dimension to mass spectrometry, providing structural insights into aromatic core motifs and enabling isomeric differentiation. This differentiation is further enhanced by linear regression algorithms, which allow for the semiquantitative analysis of isomer mixtures. Comparison between standard spectra and complex sample spectra reveals high correlation values for certain peaks, strongly indicating the presence of specific PAHs and distinguishing between phenanthrene and anthracene in fossil- and biobased samples.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Enhanced Multiphoton Ionization; Single-photon Ionization; Polycyclic Aromatic-hydrocarbons; Density-functional Theory; Complex Gas-mixtures; Selective Detection; Excited-state; Photoionization; Ms; Polyacenes
ISSN (print) / ISBN
0003-2700
e-ISSN
1520-6882
Journal
Analytical Chemistry
Publisher
American Chemical Society (ACS)
Publishing Place
1155 16th St, Nw, Washington, Dc 20036 Usa
Non-patent literature
Publications
Reviewing status
Peer reviewed
Grants
BMWK-funded "NH3-stat" project
European Regional Development Fund (EFRE)
Bruker FT-ICR MS
DFG
Department of Piston Machinery and Internal Combustion Engines of the University of Rostock
European Commission
European Regional Development Fund (EFRE)
Bruker FT-ICR MS
DFG
Department of Piston Machinery and Internal Combustion Engines of the University of Rostock
European Commission