论文部分内容阅读
本文用具有原子分辨率的场离子显微镜(FIM)配合脉冲宽度为5ns的氮分子激光加热技术对Pt、Ir表面重构进行研究。图1给出典型的Pt(110)面从(1×1)到(1×2)表面重构的元过程,可以看到这是原子沿通道(沿[110]方向)和跨通道(沿[001]方向)跃迁造成的。单个原子扩散很少遇到。因表面重构发生的温度很低,400k,似乎和质量扩散数据不吻合。实验常观察到在激光加热后整个原子列同时跃迁,如图2所示。设想(1×1)到(1×2)的转变与孤立波(Saloton wave)的传播有关并非单原子扩散引起的。在Ir(110),(131)及Pt(131)面也观察到从(1×1)到(1×2)的转变,仅转变温度各不
In this paper, the surface reconstruction of Pt and Ir was studied by field ion microscope (FIM) with atomic resolution and nitrogen laser heating with pulse width of 5ns. Figure 1 shows a meta-process for the reconstruction of a typical Pt (110) plane from (1 × 1) to (1 × 2). It can be seen that this is a function of the atomic path along the [110] [001] direction) caused by the transition. A single atomic diffusion is rarely encountered. Due to the low temperature at which the surface reconstruction takes place, it appears that 400 k does not agree with the mass diffusion data. Experiments often observed in the laser heat after the entire atomic column transition, shown in Figure 2. It is assumed that the transition from (1 × 1) to (1 × 2) is related to the propagation of the soliton wave and not to monatomic diffusion. Transitions from (1 × 1) to (1 × 2) were also observed on the Ir (110), (131) and Pt (131) planes with only the transition temperatures