首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Direct Trace Fitting of Experimental Data Using the Master Equation: Testing Theory and Experiments on the OH + C2H4 Reaction
【24h】

Direct Trace Fitting of Experimental Data Using the Master Equation: Testing Theory and Experiments on the OH + C2H4 Reaction

机译:使用主方程直接跟踪实验数据的拟合:测试理论与OH + C2H4反应的实验

获取原文
获取原文并翻译 | 示例
           

摘要

Laser flash photolysis coupled with laser-induced fluorescence observation of OH has been used to observe the equilibration of OH + C2H4 <-> HOC2H4 over the temperature range 563-723 K and pressures of bath gas (N-2) from 58 to 250 Torr. The time-resolved OH traces have been directly and globally fitted with a master equation in order to extract Delta H-R(0)0, the binding energy of the HOC2H4 adduct, with respect to reagents. The global approach allows the role that OH abstraction plays at higher temperatures to be identified. The resultant value of Delta H-R(0)0, 111.8 kJ mol(-1), is determined to be better than 2 kJ mol(-1) and is in agreement with our ab initio calculations (carried out at the CCSD(T)/CBS//M06-2X/aug-cc-pVTZ level), 111.4 kJ mol(-1), and other state of the art calculations. Parameters for the abstraction channel are also in good agreement with previous experimental studies. To effect this analysis, the MESMER master equation code was extended to directly incorporate secondary chemistry: diffusional loss from the observation region and reaction with the photolytic precursor. These extensions, which, among other things, resolve issues related to the merging of chemically significant and internal energy relaxation eigenvalues, are presented.
机译:激光闪光光解与激光诱导的荧光观察OH已被用于观察OH + C 2 H 4 - HOC2H4的平衡,在563-723K和浴气体(N-2)的压力从58-250托进行。时间分辨的OH迹线直接和全球配有母部方程,以提取δH-R(0)0,相对于试剂的Hoc2H4加合物的结合能。全局方法允许OH抽象在要识别的更高温度下扮演的角色。 ΔHr(0)0,111.8kjmol(-1)的所得值确定为优于2kJMol(-1),并与我们的AB Initio计算一致(在CCSD(T)进行/ CBS // M06-2X / AUG-CC-PVTZ级别),111.4 kJ摩尔(-1),以及其他最先进的计算。抽象信道的参数也与先前的实验研究同时吻合。为了实现该分析,MESMER主级等式代码扩展到直接包含二次化学:从观察区域扩散损失和与光解前体的反应。这些扩展在其他方面,呈现了解决与化学显着和内部能量松弛特征值的合并有关的问题。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号