Atmospheric oxidation intermediates: Laser spectroscopy of resonance-stabilized radicals from p-cymene

作者：Troy Tyler P; Tayebjee Murad J Y; Nauta Klaas; Kable Scott H; Schmidt Timothy W^*

来源：Chemical Physics Letters, 2015, 620: 129-133.

DOI：10.1016/j.cplett.2014.12.007

Several resonance-stabilized radicals are observed as products of an electrical discharge containing p-cymene, a biogenic monoterpene that contributes to secondary organic aerosols after atmospheric oxidation. Three radicals are identified by resonant 2-color 2-photon ionization mass spectrometry, corresponding to loss of a methyl group or hydrogen atom from the parent p-cymene structure. The radicals are found to absorb in the spectral region consistent with a benzylic chromophore. The spectrum observed on m/z 119 is assigned to alpha,4-dimethylbenzyl radical, and those on m/z 133 to the alpha,alpha,4-trimethylbenzyl and p-isopropylbenzyl radicals, the latter two being intermediates in the atmospheric oxidation of p-cymene.

• 出版日期2015-1-20