排序方式: 共有8条查询结果,搜索用时 171 毫秒
1
1.
2.
EFFECT OF ATOMIC HYDROGEN ON THE ACETYLENE-ADSORBED Si(100)(2×1) SURFACE AT ROOM TEMPERATURE 下载免费PDF全文
High resolution electron energy loss spectroscopy, low energy electron diffraction and quadrupole maas spectrometer (QMS) have been employed to study the effect of atomic hydrogen on the acetylene-saturated pre-adsorbed Si(100)(2×1) surface and the surface phase transition at room temperature. It is evident that the atomic hydrogen has a strong effect on the adsorbed C2H2 and the underlying surface structure of Si. The experimental results show that CH and CH2 radicals co-exist on the Si surface after the dosing of atomic hydrogen; meanwhile, the surface structure changes from Si(100)(2×1) to a dominant of (1×1). These results indicate that the atomic hydrogen can open C=C double bonds and change them into C-C single bonds, transfer the adsorbed C2H2 to C2Hx(x = 3,4) and break the underlying Si-Si dimer, but it cannot break the C-C bond intensively. The QMS results show that some C4 species axe formed during the dosing of atomic hydrogen. It may be the result of atomic hydrogen abstraction from C2Hx which leads to carbon catenation between two adjacent C-C directs. The C4 species formed are stable on Si(100) surfaces up to 1100 K, and can be regarded as the potential host of diamond nucleation. 相似文献
3.
4.
5.
EFFECT OF ATOMIC HYDROGEN ON THE ACETYLENE-ADSORBED Si(100)(2×1) SURFACE AT ROOM TEMPERATURE 下载免费PDF全文
High resolution electron energy loss spectroscopy, low energy electron diffraction and quadrupole maas spectrometer (QMS) have been employed to study the effect of atomic hydrogen on the acetylene-saturated pre-adsorbed Si(100)(2×1) surface and the surface phase transition at room temperature. It is evident that the atomic hydrogen has a strong effect on the adsorbed C2H2 and the underlying surface structure of Si. The experimental results show that CH and CH2 radicals co-exist on the Si surface after the dosing of atomic hydrogen; meanwhile, the surface structure changes from Si(100)(2×1) to a dominant of (1×1). These results indicate that the atomic hydrogen can open C=C double bonds and change them into C-C single bonds, transfer the adsorbed C2H2 to C2Hx(x = 3,4) and break the underlying Si-Si dimer, but it cannot break the C-C bond intensively. The QMS results show that some C4 species axe formed during the dosing of atomic hydrogen. It may be the result of atomic hydrogen abstraction from C2Hx which leads to carbon catenation between two adjacent C-C directs. The C4 species formed are stable on Si(100) surfaces up to 1100 K, and can be regarded as the potential host of diamond nucleation. 相似文献
6.
传统大学物理实验的考核与评价主要依靠书面考试和教师观察,评价效率低,忽视实验过程,难以全面客观的评价学生实验.本文设计了一种实验过程的视频与实验数据同步记录系统,介绍系统设计、系统实现并以RLC串联电路实验为例介绍系统的应用.实验视频和数据记录为实验评价提供全面、客观的评价依据,通过对实验数据的可视化呈现、数据分析、实验细节的视频和数据联动检索,提高实验评价效率和科学性. 相似文献
7.
连续波核磁共振实验是近代物理实验中具有代表性的一个实验.本文提出一种新型磁铁控制功率源设计,该功率源能够产生有直流偏置的交变电流,直流偏置大小与交变电流的大小和波形都可调节,驱动绕在永磁体上的一组线圈,改变主磁场大小和扫场的扫场模式. 相似文献
8.
吉木萨尔县园林鼠类群落的研究 总被引:7,自引:2,他引:5
1995年5月~12月,在新疆吉木萨尔县林木良种试验站,对国林鼠类群落结构进行了调查研究.依不同的生境选15个样地.以铗夜法捕获的952只鼠作分类.经聚类分析,该地鼠类群落由根田鼠(5859%)、小家鼠(18.15%)、灰白鼠(18.46%)、小林姬鼠(3.52%)、红尾沙鼠(0.80%)、草原兔尾鼠(0.48%)组成,可划分为根田鼠+灰白鼠群落和小家鼠+灰白鼠群落两种. 相似文献
1