Ion−Molecule Branching Ratios at High Temperature: Vibrational Energy Promotes Formation of New Channels in the Reaction of O<sub>2</sub><sup>+</sup> with CH<sub>4</sub>
作者:A. A. Viggiano、Itzhak Dotan、R. A. Morris
DOI:10.1021/ja992419z
日期:2000.1.1
shows that heating the CH4 vibrations produces new reaction product channels and enhances others. In particular, HCO+, CH3O+, and H2O+ products are seen for the first time, and the H3O+ product is much more intense in comparison with experiments on vibrationally cold CH4. The previously observed products CH3+ and CH4+ are comparable to those found with vibrationally cold CH4. We conclude that vibrational
高温流动余辉 (HTFA) 仪器经过改进,首次允许在高于 700 K 的温度下测量离子-分子支化比。该技术能够承受至少高达 1400 K 的温度,这里我们报告了在 1400 K 下测量的 O2+ 与 CH4 和 CD4 反应的支化率(对于 O2+ 与 CH4 的反应,还测量了速率常数) . 与使用漂移管和引导离子束技术的工作比较表明,加热 CH4 振动会产生新的反应产物通道并增强其他通道。特别是首次观察到 HCO+、CH3O+ 和 H2O+ 产物,与振动冷 CH4 的实验相比,H3O+ 产物的强度要高得多。先前观察到的产物 CH3+ 和 CH4+ 与在振动冷的 CH4 中发现的产物相当。我们得出结论,振动激发促进了那些需要大量键重排的通道。发现振动能量不仅可以促进...