Microscopic CO diffusion on a Pt(111) surface by time-resolved infrared spectroscopy.
Microscopic CO diffusion on a Pt(111) surface by time-resolved infrared spectroscopy.
复制标题
通过时间分辨红外光谱观察 Pt(111) 表面上的微观 CO 扩散。
DOI：
--
复制
发表时间：
1988
影响因子：
8.6
通讯作者：
Christman
中科院分区：
文献类型：
--
作者：
Reutt;Doren;Chabal;Christman
将脉冲超声分子束源和时间分辨表面红外光谱相结合，设计了一种测量分子在表面微观扩散的新技术。在周期性阶梯状的Pt111晶面快速照射到低总覆盖率的CO(0.006单层)后，以高达5ms的时间分辨率监测了CO分子从阶地迁移到阶跃位的时间演化。与简单的动力学模型相比，数据揭示了CO在(111)面上在所研究的$T=95-195$K范围内扩散的统计微观跳跃速率。
A new technique, combining a pulsed supersonic molecular-beam source and time-resolved surface infrared spectroscopy, has been devised to measure the microscopic diffusion of molecules at surfaces. Following a rapid dose of a periodically stepped Pt(111) crystal face to a low total coverage of CO (\ensuremath{\sim}0.006 monolayer), the time evolution of CO molecules migrating from terrace to step sites was monitored with a temporal resolution as fast as 5 msec. When compared with a simple kinetic model, the data reveal statistical microscopic hopping rates for CO diffusion on the (111) plane over the $T=95\ensuremath{-}195$ K range investigated.