Initial growth of the water layer on (1 x 1)-oxygen-covered Ru(0001) in comparison with that on bare Ru(0001).
Initial growth of the water layer on (1 x 1)-oxygen-covered Ru(0001) in comparison with that on bare Ru(0001).
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DOI：
10.1021/jp052167q
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发表时间：
2005-08
期刊：
影响因子：
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通讯作者：
Michel Malick Thiam;T. Kondo;N. Horimoto;H. Kato;M. Kawai
中科院分区：
文献类型：
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作者：
Michel Malick Thiam;T. Kondo;N. Horimoto;H. Kato;M. Kawai
用程序升温脱附（TPD）和红外反射吸收光谱（IRAS）研究了水（D_2O）层在（1 × 1）氧覆盖的Ru（0001）表面的初始生长，并与裸Ru（0001）表面的生长进行了比较.虽然水分子吸附在裸露的和（1 × 1）-氧覆盖的Ru（0001）通常倾向于形成氢键时，流动性发生在加热，TPD和IRAS测量的两个表面表现出明显的差异。在（1 × 1）-氧覆盖的Ru（0001），大部分的D2 O分子解吸峰在160 K，即使在亚单层覆盖，冷凝水解吸。吸附的D2 O的振动光谱也显示出宽峰，如冷凝水相，从低覆盖率的开始。此外，对于亚单层覆盖，我们发现了在2650 cm（-1）附近的特征O-D伸缩模式，这在裸Ru（0001）上的D2 O中从未清楚地观察到。因此，我们提出了一个独特的水吸附结构（1 × 1）-氧覆盖的Ru（0001），并讨论了其对水层生长的影响相比，裸Ru（0001）上的D2 O的情况。
The initial growth of a water (D2O) layer on (1 x 1)-oxygen-covered Ru(0001) has been studied in comparison with that on bare Ru(0001) by means of temperature-programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRAS). Although water molecules adsorbed on both bare and (1 x 1)-oxygen-covered Ru(0001) commonly tend to form hydrogen bonds with each other when mobility occurs upon heating, the TPD and IRAS measurements for the two surfaces exhibit distinct differences. On (1 x 1)-oxygen-covered Ru(0001), most of the D2O molecules were desorbed with a peak at 160 K, even at submonolayer coverage, as condensed water desorption. The vibration spectra of adsorbed D2O also showed broad peaks such as a condensed water phase, from the beginning of low coverage. For submonolayer coverage, in addition, we found a characteristic O-D stretching mode at around 2650 cm(-1), which is never clearly observed for D2O on bare Ru(0001). Thus, we propose a distinctive water adsorption structure on (1 x 1)-oxygen-covered Ru(0001) and discuss its influence on water layer growth in comparison with the case of D2O on bare Ru(0001).