Critical Assessment of Photoionization Efficiency Measurements for Characterization of Soot-Precursor Species

The Journal of Physical Chemistry. a
K Olof JohanssonHope A Michelsen

Abstract

We present a critical evaluation of photoionization efficiency (PIE) measurements coupled with aerosol mass spectrometry for the identification of condensed soot-precursor species extracted from a premixed atmospheric-pressure ethylene/oxygen/nitrogen flame. Definitive identification of isomers by any means is complicated by the large number of potential isomers at masses likely to comprise particles at flame temperatures. This problem is compounded using PIE measurements by the similarity in ionization energies and PIE-curve shapes among many of these isomers. Nevertheless, PIE analysis can provide important chemical information. For example, our PIE curves show that neither pyrene nor fluoranthene alone can describe the signal from C16H10isomers and that coronene alone cannot describe the PIE signal from C24H12species. A linear combination of the reference PIE curves for pyrene and fluoranthene yields good agreement with flame-PIE curves measured at 202 u, which is consistent with pyrene and fluoranthene being the two major C16H10isomers in the flame samples, but does not provide definite proof. The suggested ratio between fluoranthene and pyrene depends on the sampling conditions. We calculated the values of the adiabatic-io...Continue Reading

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Jul 14, 2016·Proceedings of the National Academy of Sciences of the United States of America·K Olof JohanssonHope A Michelsen
May 19, 2017·The Journal of Physical Chemistry. a·K Olof JohanssonHope A Michelsen

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Citations

Feb 3, 2018·Physical Chemistry Chemical Physics : PCCP·Lena RuweKatharina Kohse-Höinghaus
Feb 21, 2019·Physical Chemistry Chemical Physics : PCCP·Hanfeng JinAamir Farooq
Jan 1, 2018·The Review of Scientific Instruments·M F CampbellH A Michelsen
Aug 28, 2020·The Journal of Physical Chemistry. a·Evguenii KozliakAlena Kubátová
Mar 3, 2020·The Journal of Physical Chemistry. a·Te-Chun ChuWilliam H Green
Jul 24, 2020·The Journal of Physical Chemistry. a·Hua GuoTimothy Zwier

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