The influence of adsorbate interactions on kinetics and equilibrium for CO on Ru(001). I. Adsorption kinetics
The influence of adsorbate interactions on kinetics and equilibrium for CO on Ru(001). I. Adsorption kinetics
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吸附质相互作用对 Ru(001) 上 CO 动力学和平衡的影响。
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
D. Menzel
中科院分区：
文献类型：
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作者：
H. Pfnür;D. Menzel
经过仔细的校准，CO吸附在Ru（001）上引起的功函数变化被用来测量粘附系数s作为样品温度（100 - 400 K）和覆盖度的函数，气体温度总是在295 K左右。结果表明：在θ=0时，在100 ~ 400 K范围内，粘附系数与温度无关;在θ <0.2时，粘附系数与温度无关。当Ts = 200 K时，s与（1-θ）成比例下降，低于200 K时，s下降得更慢;在100 K时，s缓慢下降，直到θ=0.5。在θ=0.23以上，当Ts = 120 K时，s开始急剧下降;当Ts<360 K时，在θ = 0.35附近出现第二个平台。接近饱和时，s下降到10−2以下。这些结果进行了讨论的前体模型的化学吸附层上的前体的性能具有很强的影响。一个关键的评估所涉及的正式前体状态表明，经典的前体状态只存在于可观的覆盖范围，并定义的横向和垂直的相互作用，而在l…
After careful calibration, the work function change induced by CO adsorption on Ru(001) has been used to measure the sticking coefficient s as functions of sample temperature (between 100 and 400 K) and coverage, with the gas temperature always at about 295 K. The main results are: At θ=0, the sticking coefficient is independent of sample temperature between 100 and 400 K, at s0=0.7 for 0<θ<0.2. s drops proportional to (1–θ) for Ts≳200 K, and more gradually below 200 K; at 100 K, s drops slowly up to θ=0.5. Above θ=0.23 a sharp decrease of s sets in for Ts≳120 K; a second plateau becomes obvious around θ∼0.35 for Ts<360 K. Close to saturation, s drops to below 10−2. These results are discussed in terms of a precursor model with strong effects of the chemisorbed layer on the properties of the precursor. A critical evaluation of the formal precursor states involved suggests that classical precursor states exist only at appreciable coverage and are defined by the lateral and vertical interactions, while at l...