作 者: (魏雅雯); (张佩); (胡晓翠); (靳玲侠);
机构地区: 长安大学杂志社,西安710064 陕西师范大学化学学工学院,陕西省大分子科学重点实验室,西安710062
出 处: 《原子与分子物理学报》 2017年第4期592-600,共9页
摘 要: 采用CCSD(T)/cc-p VTZ//B3LYP/6-311++G(2df,2p)水平上对CH_3CHOH+HO_2和CH_3CH_2O+HO_2反应体系的单、三重态反应机理进行了详细的理论研究.计算结果表明,CH_3CHOH+HO_2反应主要发生在单重态势能面上,其中四条通道均为快速自发过程;CH_3CH_2O+HO_2反应在三重态势能面上的通道CH_3CH_2O+HO_2→~3IM11→~3TS11→P11(CH_3CH_2OH+~3O_2)为动力学和热力学的优势路径.大气中CH_3CHOH比CH_3CH_2O更容易稳定存在. The reaction mechanisms of CH3CH20 + HO2 and CH3CH=O + HO2 have been investigated at the CCSD (T)/ce -pVTZ//B3 LYP/6 -311 + + G(2df, 2p) level of theory. The single and triplet point energies a- long the minimum energy potential were calculated. The results show that the channels of CH3 CHOH + HO2 on the singlet potential energy surfaces (PES) are all fast spontaneous processes, whereas that of CH3CH20 + H02 proceeds as CH3CH20 + HO2--+ 3IMll --~ 3TSll --+ Pll (CH3CH2OH + 302) on the triplet PES are favorable at dynamics and thermodynamics. In the atmosphere, CH3CHOH is more stable than CH3CH20.