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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Ozonolysis of 3-carene in the atmosphere. Formation mechanism of hydroxyl radical and secondary ozonides
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Ozonolysis of 3-carene in the atmosphere. Formation mechanism of hydroxyl radical and secondary ozonides

机译:大气中3-甲烯的臭氧溶解。 羟基自由基和二次臭氧的形成机制

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摘要

The gas-phase ozonolysis mechanism of 3-carene is investigated using high level quantum chemistry and kinetic calculations. The reaction follows the Criegee mechanism with an initial addition of O-3 to the ?C?C? bond, followed by a chain of unimolecular isomerizations, as 3-carene + O-3 POZs (primary ozonides) CIs (Criegee intermediates, 4 conformers) Ps (products). In the course of the reaction, a large excess of energy retained in the POZs* lead to the prompt unimolecular processes in POZs*, CIs*, and Ps*, and only approximate to 4% of CIs* could be stabilized by collision at 298 K and 760 Torr. From RRKM-ME calculations, the VHPs* could further dissociate to vinoxy-type radical and OH radical, the SOZs* could isomerize to 3-caronic acid, and DIOs* could be stabilized via collision. The fractional yield of OH radical, in the range of 0.56 to 0.59, agrees reasonably well with the previously measured value of 1.06 (with an uncertainty factor of 1.5).
机译:采用高水平量子化学和动力学计算研究了3-肠的气相臭氧机制。 反应遵循Criegee机制,初步加入O-3到?C?C? 粘合,其次是一链单分子异构化,作为3- carene + O-3 Pozs(初级臭氧)cis(Criaegee中间体,4个塑壳)ps(产物)。 在反应过程中,保留在Pozs中的大量能量*导致Pozs *,CIS *和PS *中的促销单分子过程,并且只有298的碰撞才能稳定到4%的CIS * K和760托。 从RRKM-ME计算中,VHPS *可以进一步解离芳氧基型基团和OH激进,SOZS *可以异构化至3碳酸,DIOS *可以通过碰撞稳定。 OH自由基的分数率,在0.56至0.59的范围内,与先前测量的1.06值相当合理地吻合良好(具有不确定因子1.5)。

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    South China Univ Technol Sch Chem &

    Chem Engn Guangzhou 510640 Guangdong Peoples R China;

    South China Univ Technol Sch Chem &

    Chem Engn Guangzhou 510640 Guangdong Peoples R China;

    South China Univ Technol Sch Chem &

    Chem Engn Guangzhou 510640 Guangdong Peoples R China;

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  • 正文语种 eng
  • 中图分类 物理学;化学;
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