物理吸附Kr在TiO $_{2}$（110）表面上多层和单层区域的同步辐射核共振散射
Nuclear resonant scattering of synchrotron radiation by physisorbed Kr on TiO$_{2}$(110) surfaces in multilayer and monolayer regimes
摘要：
利用同步辐射的核共振散射（NRS）技术研究了Kr在$_{2}$（110）表面的物理吸附层，Kr层的厚度从多层到单层。测量NRS强度作为Kr暴露的函数，由此估计对应于单层的NRS信号为0.23 cps。在不同厚度下测得的时间谱显示出单调的衰减，没有任何量子拍频特征。从时间谱的分析中评估的无反冲分数$f$显示在温度从19 K升高到25 K时显著降低。作为其起源，单层Kr的有序-无序相变提出。
英文摘要：
Physisorbed Kr layers on TiO$_{2}$(110) surfaces were investigated by means of nuclear resonant scattering (NRS) of synchrotron radiation at Kr thicknesses ranging from multilayer to monolayer. The NRS intensity was measured as a function of the Kr exposure, from which the NRS signal corresponding to monolayer was estimated as 0.23 cps. The time spectra measured at various thicknesses showed a monotonous decay without any quantum beat features. The recoiless fraction $f$ evaluated from the analysis of the time spectrum revealed a substantial reduction upon temperature rise from 19 to 25 K. As its origin, an order-disorder phase transition of the monolayer Kr is proposed.
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