K-induced surface structural change of Si(1 1 1)-7 × 7 probed by second-harmonic generation |
| |
Authors: | Takanori Suzuki Youichi Karaki Dongmei Deng |
| |
Institution: | a The Institute of Physical and Chemical Research (Riken), Hirosawa 2-1, Wako, Saitama 351-0198, Japan b Yokohama National University, Tokiwadai 79-5, Hodogaya, Yokohama 240-8501, Japan |
| |
Abstract: | The growth of thin K films on Si(1 1 1)-7 × 7 has been investigated by selecting the input and output polarizations of second-harmonic generation (SHG) at room temperature (RT) and at an elevated temperature of 350 °C. The SH intensity at 350 °C showed a monotonic increase with K coverages up to a saturated level, where low energy electron diffraction (LEED) showed a 3 × 1 reconstructed structure. The additional deposition onto the K-saturated surface at 350 °C showed only a marginal change in the SH intensity. These variations are different from the multi-component variations up to 1 ML and orders of magnitude increase due to excitation of plasmons in the multilayers at RT. The variations of SHG during desorption of K at 350 °C showed a two-step decay with a marked shoulder which most likely corresponds to the saturation K coverage of the Si(1 1 1)-3 × 1-K surface. The dominant tensor elements contributing to SHG are also identified for each surface. |
| |
Keywords: | 68 35 Rh 68 43 &minus h 73 20 Mf 78 66 D6 |
本文献已被 ScienceDirect 等数据库收录! |
|