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    A mid-infrared diagnostic for benzene using a tunable difference-frequency-generation laser

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    Revised Manuscript (1).pdf
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    581.6Kb
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    Description:
    Accepted manuscript
    Embargo End Date:
    2022-09-16
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    Type
    Article
    Authors
    Shakfa, Mohammad Khaled cc
    Mhanna, Mhanna
    Jin, Hanfeng cc
    Liu, Dapeng cc
    Djebbi, Khalil
    Marangoni, Marco
    Farooq, Aamir cc
    KAUST Department
    Chemical Kinetics & Laser Sensors Laboratory
    Clean Combustion Research Center
    Mechanical Engineering
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2020-09-16
    Online Publication Date
    2020-09-16
    Print Publication Date
    2020-09
    Embargo End Date
    2022-09-16
    Submitted Date
    2019-11-08
    Permanent link to this record
    http://hdl.handle.net/10754/665391
    
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    Abstract
    Benzene is a very important molecule in a variety of industrial, environmental, and chemical systems. In combustion, benzene plays an essential role in the formation and growth of polycyclic aromatic hydrocarbons and soot. In this work, a new laser-based diagnostic is presented to make quantitative, interference-free, and sensitive measurements of benzene in the mid-infrared (MIR) region. The diagnostic is based on a widely tunable difference-frequency-generation (DFG) laser system. We developed this laser source to emit in the MIR between 666.54 cm-1 and 790.76 cm-1 as a result of the DFG process between an external-cavity quantum-cascade-laser and a CO2 gas laser in a nonlinear, orientation-patterned GaAs crystal. Benzene measurements were carried out at the peak (673.94 cm-1) of the Q-branch of the v11 vibrational band of benzene. The absorption cross-section of benzene was measured over a range of pressures (4.44 mbar to 1.158 bar) at room temperature. The temperature dependence of the absorption cross-section was studied behind reflected shock waves over 553-1473 K. The diagnostic was demonstrated in a high-temperature reactive experiment of benzene formation from propargyl radicals. The new diagnostic will prove highly beneficial for high-temperature studies of benzene formation and consumption kinetics.
    Citation
    Shakfa, M. K., Mhanna, M., Jin, H., Liu, D., Djebbi, K., Marangoni, M., & Farooq, A. (2020). A mid-infrared diagnostic for benzene using a tunable difference-frequency-generation laser. Proceedings of the Combustion Institute. doi:10.1016/j.proci.2020.06.382
    Sponsors
    Research reported in this publication was funded by the Office of Sponsored Research and King Abdullah University of Science and Technology (KAUST).
    Publisher
    Elsevier BV
    Journal
    Proceedings of the Combustion Institute
    DOI
    10.1016/j.proci.2020.06.382
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S1540748920305095
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.proci.2020.06.382
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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