主题：【已应助】Vacuum Ultraviolet Photoionization Mass Spectra and Cross-Sections for Volatile Organic Compounds at 10.5 eV

Authors: Kanno, Nozomu; Tonokura, Kenichi

Source: Applied Spectroscopy, Volume 61, Issue 8, Pages 150A-170A and 797-907 (August 2007) ,pp. 896-902(7)

Publisher: Society for Applied Spectroscopy

Abstract:
Vacuum ultraviolet single-photon ionization time-of-flight mass spectrometry (VUV-SPI-TOFMS) has been applied to the
detection of volatile organic compounds (VOCs), including aromatic, chlorinated, and oxygenated compounds.
Photoionization mass spectra of 23 VOCs were measured using SPI-TOFMS at 10.5 eV (118 nm). The limits of
detection of VOCs using SPI-TOFMS at 10.5 eV were estimated to be a few ppbv. The mass spectra of 20 VOCs exhibit
only the parent ion and its isotopes' signals. The ionization processes of the VOCs were discussed on the basis of the
reaction enthalpies predicted by the quantum chemical calculations. Absolute photoionization cross-sections for 23
VOCs, including 12 newly measured VOCs, at 10.5 eV were determined in comparison to the reported absolute
photoionization cross-section of NO

Keywords: PHOTOIONIZATION MASS SPECTRA; PHOTOIONIZATION CROSS-SECTIONS; SINGLE PHOTON
IONIZATION; VOLATILE ORGANIC COMPOUNDS