Methanation on Ir surfaces at low gas pressure and temperature
作者:C.L. Bao、T.T. Tsong
DOI:10.1016/0039-6028(88)90619-x
日期:1988.1
Abstract Methanation on Ir surfaces at low gas pressure (∼10 −8 Torr) and lowtemperature (150 K) has been observed using pulsed-laserimaging atom probe. The reaction intermediates can be detected in the pulsed-laser field desorption time-of-flight mass spectrum, thus it is possible to study the reaction steps in detail. Based on our results, it is reasonable for us to conclude that formation of methane
摘要 已使用脉冲激光成像原子探针在低气压(~10 -8 Torr)和低温(150 K)下观察到 Ir 表面的甲烷化。可以在脉冲激光场解吸飞行时间质谱中检测反应中间体,从而可以详细研究反应步骤。根据我们的结果,我们可以合理地得出结论,在低气压和低温下,甲烷的形成是通过从铱表面上的一氧化碳解离的表面碳的氢化作用形成的。我们还研究了 CH 4 和 CO 2 产生的压力依赖性,并在我们的实验条件下观察了 CH 4 + 和 CO 2 + 信号强度的振荡,时间周期约为 8 秒。
The first experimental observation of stable H4+ ions
作者:Nicholas J. Kirchner、James R. Gilbert、Michael T. Bowers
DOI:10.1016/0009-2614(84)87002-5
日期:1984.4
temperature ion source is used to generate H5+ from ionized H2. A mass selected H5+ beam is collisionally dissociated and the products mass and energy analyzed. The dominant product is H3+ but a significant H4+ signal is observed. These ions survived at least 10−6 s from the collision cell to the detector and are thus stable to dissociation. Kinetic energy distributions of the H3+ and H4+ product ions are
Ion cyclotron resonance studies on the reaction of H<sub>2</sub><sup>+</sup> and D<sub>2</sub><sup>+</sup> ions with various simple molecules and hydrocarbons
作者:J. K. Kim、W. T. Huntress
DOI:10.1063/1.430817
日期:1975.4
The rate constants and product distributions for the reactions of H2+ ions with N2, O2, and CO, and for the reactions of both H2+ and D2+ ions with CH4, CD4, NH3, H2O, H2S, C2H2, C2H4, and C2H6 have been measured by ion cyclotron resonance methods. Proton transfer dominates in the reaction with diatomic molecules, and charge transfer dominates in the reaction with polyatomic molecules. However, a significant amount of charge transfer was observed in the reaction of H2+ ions with O2 and CO, and a significant amount of proton transfer was observed in the reaction of H2+ ions with H2O. The reaction with methane to form methyl cations appears to involve a superposition of both dissociative charge transfer and proton transfer followed by H2 elimination. The extent of fragmentation resulting from H2+ charge exchange to CH4 is on the order of that observed in photoionization and Penning ionization of CH4 at 16 eV total available energy, and much larger than is observed in electron impact of CH4 at 16 eV.