Oxidation of H on Rh(111): H2O product velocity and angular distributions
Oxidation of H on Rh(111): H2O product velocity and angular distributions
复制标题
H 在 Rh(111) 上的氧化：H2O 产物速度和角分布
DOI：
--
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
S. Sibener
中科院分区：
文献类型：
--
作者：
K. Gibson;J. Colonell;S. Sibener
在两种不同的氧覆盖范围下，测量了 H2 和 O2 在 Rh(111) 上反应生成的 H2O 产物的平移能量分布，作为表面温度的函数。麦克斯韦-玻尔兹曼速度分布很好地代表了结果，明显低于表面温度。对于 [O]=0.2 单层 (ML)，产物 H2O 比 [O]=0.1 ML 时稍快。当从 Rh(111) 散射低能 H2O 分子束时，能量分布与捕获和解吸分子观察到的能量分布非常接近。我们还测量了 Ts=650 K 时产物 H2O 的能量和强度的角度依赖性。H2O 产物的速度分布与最终角度无关，相对强度呈余弦分布。
The translational energy distribution for the H2O product from the reaction of H2 and O2 on Rh(111) was measured as a function of surface temperature at two different oxygen coverages. The results are well represented by Maxwell–Boltzmann velocity distributions significantly cooler than the surface temperature. For [O]=0.2 monolayers (ML), the product H2O is slightly faster than for [O]=0.1 ML. The energy distributions are very close to those observed for the trapped and desorbed molecules when scattering low energy H2O molecular beams from the Rh(111). We also measured the angular dependence of the energy and intensity of the product H2O at Ts=650 K. The velocity distribution of the H2O product is independent of final angle, and the relative intensities are cosine distributed.