The adsorption of hydrogen on a ruthenium (101̄0) surface
The adsorption of hydrogen on a ruthenium (101̄0) surface
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氢在钌（101̄0）表面的吸附
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
K. Christmann
中科院分区：
文献类型：
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作者：
G. Lauth;E. Schwarz;K. Christmann
使用Video-LEED、HREELS、TDS和Δφ测量研究了Ru（1010）/H体系在100 - 500 K之间的吸附、结构和振动性质。在所有温度下，氢以解离吸附的方式吸附，具有非常高的初始粘附概率（s 0 ≤ 1.0），具有明显的前体机制。在100 K下的饱和覆盖率非常高（Θmax =2 × 1.728×1015 H atoms cm−2），在这个覆盖率下，可以区分出四种H结合态α、β1、β2和β3，其脱附能在56 KJ/mol（α）和80 KJ/mol（β3）之间。H结合状态与四个可观察到的有序H相密切相关：在Θ=1时，出现具有弱分裂点的a c（8×2）或“1 × 2”结构，其在较高覆盖率下转变为具有同样弱点的清晰1×2相，并且在Θ=1.2时具有最大强度。它遵循c（2×2）-3 H相（在Θ=1.5时I最大），具有更强的“额外”斑点，这些斑点随着覆盖度的增加而逐渐消失，直到在Θ=2.0时达到（1×1）-2 H图案。
Video‐LEED, HREELS, TDS, and Δφ measurements were used to investigate the adsorptive, structural, and vibrational properties of the Ru(1010)/H system between 100 and 500 K. At all temperatures investigated hydrogen adsorbs dissociatively with very high initial sticking probability (s0≈1.0) with apparent precursor mechanism. The saturation coverage at 100 K is extraordinarily high (Θmax =2≂1.728×1015 H atoms cm−2), up to this coverage four H binding states α, β1, β2, and β3 can be distinguished having desorption energies between 56 KJ/mol (α) and 80 KJ/mol (β3). The H binding states are intimately correlated with the four observable ordered H phases: At Θ=1 a c(8×2) or ‘‘1×2’’ structure with weak split spots appears which transforms at higher coverages into a clear 1×2 phase with likewise weak spots and with maximum intensity at Θ=1.2. It follows a c(2×2)‐3H phase (I maximum at Θ=1.5) with rather more intense ‘extra’ spots which fade away with increasing coverage until at Θ=2.0 a (1×1)‐2H pattern is reach...