Reaction Dynamics of Atomic Hydrogen with H-terminated Si Surfaces

我们的研究目的是研究氢诱导Si（100）表面D原子吸附的动力学。吸附-诱导-脱附（AID）是吸附-诱导-脱附（ABS）的两种途径。实验结果表明：（1）沿沿着ABS和AID反应路径解吸分子的角分布，解吸产率的角分布在两条路径的法线方向均出现最大值;结果很好地解释了模拟采用LEPS势。这篇文章已经准备好作为论文提交给期刊。(2)D用斩波H-束技术研究了AID通道上的沿着_2解吸。斩波H光束的宽度为1.5 s，持续时间为3 s。HD解吸沿着ABS通道显示出对入射H脉冲的快速响应，表明提取反应是直接的。另一方面，D_2解吸沿着AID途径显示， 关于我们 快速解吸通道被理解为由于当局部形成的1x 1二氢化物相塌陷到原始的3x 1二氢化物相时发生的分子发射。J.Chem.Phys.121（3）采用进一步缩短的H-束研究了D_2在AID通道上的沿着脱附。斩波H光束的宽度为0.5 s，持续时间为10 s。HD解吸沿着ABS通道显示出对入射H脉冲的快速响应，表明提取反应是直接的。另一方面，D_2沿AID途径的沿着解吸表现出多组分特征，其寿命分别为0.05、0.8和30 s。最快的解吸通道被理解为由于当局部形成的1x 1二氢化物相塌陷成原始的3x 1二氢化物相时发生的分子发射。第二快的路径被理解为由于分子发射时，3x 1二氢化物相形成在H照射。第三种成分是由于分子发射通道时，多余的3x 1二氢化物相被破坏。论文已提交给Surf Face Science。少

Our Aim of the research is to investigate the dynamics of H-induced abstraction of surface D adatoms on the Si(100) surfaces. There are two kinds of abtraction paths : one is direct abstraction (ABS) and the other is adsorption-induced-desorption(AID) of surfaced adatams. From experiments w e clarified following things :(1)Angular distribution of molecules desorbed along ABS and AID reaction pathways.The angular distributions of desorption yields show a maximum at the normal direction for both paths. Results were well explained by the simulation employing LEPS potential. This has been prepared to be submitted to a journal as a paper.(2)D_2 desorptions along the AID channel were studied by means of a chopped H-beam technique. The width of the chopped-H beam was 1.5 s and duration was 3 s. The HD desorption along the ABS channel showed a quick response to the incident H pulse, suggesting the abstraction reaction is direct. On the other hand, D_2 desorption along the AID pathway showed no … More t only a similar quick path but also a delayed path. The fast desorption channel was understood as due to molecular emissions that occur when locally formed 1x1 dihydride phases collap into the original 3x1 dihydride phases. A paper was published (J.Chem.Phys.121,3221(2004))(3)D_2 desorptions along the AID channel were studied by employing further shortned H-beam. The width of the chopped-H beam was 0.5 s and duration was 10 s. The HD desorption along the ABS channel showed a quick response to the incident H pulse, suggesting abstraction reaction is direct. On the other hand, D_2 desorption along the AID pathway showed multi components chracterized with 0.05,0.8 and 30 s lifetimes. The fastest desorption channel was understood as due to molecular emissions that occur when locally formed 1x1 dihydride phases collap into the original 3x1 dihydride phases. The second fastest path was understood as due to molecular emission when 3x1 dihydride phases are formed during H irradiation. The third component was attributed to the molecular emission channel when the excess 3x1 dihydride phases are destroyed. Apaper has been submitted to Surf face Science. Less