Determination of absolute photoionization cross-sections of some aromatic hydrocarbons.

Embargo End Date
2021-07-18

Type
Article

Authors
Jin, Hanfeng
Yang, Jiuzhong
Farooq, Aamir

KAUST Department
Chemical Kinetics & Laser Sensors Laboratory
Clean Combustion Research Center
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division

Online Publication Date
2020-08-27

Print Publication Date
2020-11-15

Date
2020-08-27

Submitted Date
2020-05-01

Abstract
RATIONALE:Aromatic hydrocarbons play an important role in the formation and growth of polycyclic aromatic hydrocarbon (PAH) and soot particles. Measurements of their absolute photoionization cross-sections (PICSs), that benefits the quantitative investigation of mass spectrometry, are still lacking, however. METHODS:PICSs of some aromatic hydrocarbons were measured with tunable synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS). Nitric oxide and benzene were chosen as standard references for PICS calibration, since their photoionization cross-sections are well-known in literature. Binary liquid mixtures of the investigated molecules and their specific solvents were used in the measurements. RESULTS:The investigated aromatics include naphthalene, phenanthrene, 1-methylnaphthalene, indene, 2-/3-/4-methylphenylacetylene, 2-methylindene, diphenylacetylene, 1-/2-ethynylnaphthalene and acenaphthylene. Photo-induced fragments from the molecules were also observed with increasing photon energy. CONCLUSIONS:Based on our measurements and literature data, PICSs of most aromatic molecules have very similar values beyond their ionization energies. However, molecules that contain phenylacetylene structure have PICSs higher than other aromatics.

Citation
Jin, H., Yang, J., & Farooq, A. (2020). Determination of absolute photoionization cross-sections of some aromatic hydrocarbons. Rapid Communications in Mass Spectrometry. doi:10.1002/rcm.8899

Publisher
Wiley

Journal
Rapid Communications in Mass Spectrometry

DOI
10.1002/rcm.8899

PubMed ID
32677075

Additional Links
https://onlinelibrary.wiley.com/doi/abs/10.1002/rcm.8899

Permanent link to this record