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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Vacuum laser photoionization inside the C-trap of an orbitrap mass spectrometer: Resonance-enhanced multiphoton ionization high-resolution mass spectrometry.
Anal. Chem. 93, 9418–9427 (2021)
State-of-the-art mass spectrometry with ultraviolet (UV) photoionization is mostly limited to time-of-flight (ToF) mass spectrometers with 1000-10 000 m/Δm mass resolution. However, higher resolution and higher spectral dynamic range mass spectrometry may be indispensable in complex mixture characterization. Here, we present the concept, implementation, and initial evaluation of a compact ultrahigh-resolution mass spectrometer with gas-phase laser ionization. The concept is based on direct laser photoionization in the ion accumulation and ejection trap (C-trap) of an Orbitrap mass spectrometer. Resonance-enhanced multiphoton ionization (REMPI) using 266 nm UV pulses from a frequency-quadrupled Nd:YAG laser was applied for selective and efficient ionization of monocyclic and polycyclic aromatic hydrocarbons. The system is equipped with a gas inlet for volatile compounds and a heated gas chromatography coupling. The former can be employed for rapid system m/z-calibration and performance evaluation, whereas the latter enables analysis of semivolatile and higher-molecular-weight compounds. The capability to evaluate complex mixtures is demonstrated for selected petrochemical materials. In these experiments, several hundred to over a thousand compounds could be attributed with a root-mean-square mass error generally below 1 ppm and a mass resolution of over 140 000 at 200 m/z. Isobaric interferences could be resolved, and narrow mass splits, such as 3.4 mDa (SH4/C3), are determined. Single laser shots provided limits of detection in the 20-ppb range for p-xylene and 1,2,4-trimethylbenzene, similar to compact vacuum REMPI-ToF systems.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Polycyclic Aromatic-hydrocarbons; Single-photon Ionization; Atmospheric-pressure Photoionization; Electron-impact Ionization; Real-time Analysis; Chemical-ionization; Gas-chromatography; Thermal-analysis; Crude Oils; Online
ISSN (print) / ISBN
0003-2700
e-ISSN
1520-6882
Zeitschrift
Analytical Chemistry
Quellenangaben
Band: 93,
Heft: 27,
Seiten: 9418–9427
Verlag
American Chemical Society (ACS)
Verlagsort
1155 16th St, Nw, Washington, Dc 20036 Usa
Begutachtungsstatus
Peer reviewed
Förderungen
Helmholtz International Lab. aeroHEALTH
EUROSTARS project
EUROSTARS project