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首页> 外文期刊>The Journal of Chemical Physics >Dynamics and kinetics of oxygen dissociative adsorption on Pt{110}(1x2)
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Dynamics and kinetics of oxygen dissociative adsorption on Pt{110}(1x2)

机译:Pt {110}(1x2)上氧解离吸附的动力学和动力学

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The interaction of oxygen with Pt{110}(1X2) has been investigated using supersonic molecular beams and low-energy electron, diffraction (LEED) at incident kinetic energies of 60-900 meV and surface temperatures from 170 to 1100 K. LEED studies indicate that at low exposures and low beam energies (<190 meV) oxygen does not induce a reconstruction to (1X1). However at high exposures and low beam energies, a variable unit mesh dimension Frenkel-Kontorova domain structure is observed. Sticking probability measurements on the clean surface indicate that oxygen dissociative adsorption on Pt{110}(1X2) is a predominantly precursor mediated process. At low surface temperatures (<200 K) and low beam energies, the precursor has a strong influence on the adsorption kinetics, and mixed. islands of dioxygen and adatoms are formed. Adsorption at beam temperatures below 880 K produces two states in the the thermal desorption spectroscopy spectra, but at higher incident gas temperatures a new high temperature desorption state (T-p=1020 K) can be populated, which inhibits the formation of the usual dissociatively chemisorbed states at T-p=720 and 820 K. (C) 1998 American Institute of Physics. [S0021-9606(98)70740-8]. [References: 40]
机译:使用超音速分子束和低能电子,衍射(LEED)在60-900 meV的入射动能和170至1100 K的表面温度下研究了氧与Pt {110}(1X2)的相互作用。在低曝光和低束能量(<190 meV)时,氧气不会诱导重建为(1X1)。然而,在高曝光和低束能量下,观察到可变单位网格尺寸的Frenkel-Kontorova域结构。在干净表面上的粘附概率测量结果表明,Pt {110}(1X2)上的氧离解吸附主要是前体介导的过程。在较低的表面温度(<200 K)和较低的束能量下,前体对吸附动力学有很大影响,并且会混合。形成了双氧和吸附原子的岛。在低于880 K的光束温度下的吸附在热脱附光谱中产生两个状态,但是在较高的入射气体温度下,可以填充新的高温脱附状态(Tp = 1020 K),这抑制了通常的解离化学吸附状态的形成。在Tp = 720和820K。(C)1998美国物理研究所。 [S0021-9606(98)70740-8]。 [参考:40]

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