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@ARTICLE{Nehr:15752,
      author       = {Nehr, S. and Bohn, B. and Fuchs, H. and Hofzumahaus, A. and
                      Wahner, A.},
      title        = {{HO}2 formation from the {OH} + benzene reaction in the
                      presence of {O}2},
      journal      = {Physical Chemistry Chemical Physics},
      volume       = {13},
      issn         = {1463-9076},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {PreJuSER-15752},
      pages        = {10699-10708},
      year         = {2011},
      note         = {The authors thank F. Rohrer, F. Holland, S. Lou and M.
                      Bachner for useful discussions and technical support. S.
                      Nehr thanks the Deutsche Forschungsgemeinschaft for PhD
                      studentship funding under grant BO 1580/3-1.},
      abstract     = {In this study we investigated the secondary formation of
                      HO(2) following the benzene + OH reaction in N(2) with
                      variable O(2) content at atmospheric pressure and room
                      temperature in the absence of NO. After pulsed formation of
                      OH, HO(x) (= OH + HO(2)) and OH decay curves were measured
                      by means of a laser-induced fluorescence technique (LIF). In
                      synthetic air the total HO(2) yield was determined to be
                      0.69 ± 0.10 by comparison to results obtained with CO as a
                      reference compound. HO(2) is expected to be a direct product
                      of the reaction of the intermediately formed OH-benzene
                      adduct with O(2). The HO(2) yield is slightly greater than
                      the currently recommended yield of the proposed HO(2)
                      co-product phenol $(∼53\%).$ This hints towards other,
                      minor HO(2) forming channels in the absence of NO, e.g. the
                      formation of epoxide species that was proposed in the
                      literature. For other test compounds upper limits of HO(2)
                      yields of 0.10 (isoprene) and 0.05 (cyclohexane) were
                      obtained, respectively. In further experiments at low O(2)
                      concentrations $(0.06-0.14\%$ in N(2)) rate constants of
                      (2.4 ± 1.1) × 10(-16) cm(3) s(-1) and (5.6 ± 1.1) ×
                      10(-12) cm(3) s(-1) were estimated for the OH-benzene adduct
                      reactions with O(2) and O(3), respectively. The rate
                      constant of the unimolecular dissociation of the adduct back
                      to benzene + OH was determined to be (3.9 ± 1.3) s(-1). The
                      HO(2) yield at low O(2) was similar to that found in
                      synthetic air, independent of O(2) and O(3) concentrations
                      indicating comparable HO(2) yields for the adduct + O(2) and
                      adduct + O(3) reactions.},
      keywords     = {J (WoSType)},
      cin          = {IEK-8},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      shelfmark    = {Chemistry, Physical / Physics, Atomic, Molecular $\&$
                      Chemical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:21544290},
      UT           = {WOS:000290994900034},
      doi          = {10.1039/c1cp20334g},
      url          = {https://juser.fz-juelich.de/record/15752},
}