Development of scanning TRAXS and its application to studies of surface dynamics

扫描TRAXS的发展及其在表面动力学研究中的应用

• 批准号: 10555007
• 负责人: HASEGAWA Shuji
• 金额: $ 8.83万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10555007/
• 关键词: TRAXS; scanning electron microscopy; surface chemical analysis; RHEED; Energy-dispersive X-ray detector; SREM; electromigration; surfactant epitaxy

(1) We have developed a scanning TRAXS combined with UHV-SEM-SREM apparatus, which enables simultaneous analyses of surface chemical compositions and structures of a microscopic region on surfaces.(2) We have studied electromigration phenomena with this new apparatus. A film patch of Ag was deposited on Au-precovered Si(111) surfaces, and then direct current was stressed through the crystals. The spreading ability and migration velocity of the Ag patch were round to sensitively depend on the Au coverages and corresponding surface superstructures. The results are analyzed in terms if surface alloy phase formation and step-edge barriers in migration potential.(3) By using an ability of two-dimensional mapping of surface elements, we have investigated a detection sensitivity of the scanning TRAXS with a sample surface of Ag-covered Si(111) surfaces. The results showed a high sensitivity enough for detecting monolayer Ag.(4) We have studied various surface phases induced by small amounts of Au adsorption on Si(111)-ィイD83ィエD8 X ィイD83ィエD8-Ag surface by using the scanning-TRAXS-SEM-SREM method.

(1)我们已经开发了一种扫描TRAXS结合UHV-SEM-SREM装置，它可以同时分析表面上的微观区域的表面化学成分和结构。(2)我们用这种新装置研究了电迁移现象。在Au预覆盖的Si（111）表面上沉积一片Ag膜，然后施加直流电。银斑的扩展能力和迁移速度敏感地依赖于Au覆盖率和相应的表面超结构。从表面合金相的形成和迁移势中的台阶边势垒两个方面对结果进行了分析。(3)利用表面元素的二维映射能力，我们研究了扫描TRAXS对Ag覆盖的Si（111）表面样品的探测灵敏度。结果表明，该方法具有较高的灵敏度，足以检测单层Ag。(4)本文用扫描-TRAXS-SEM-SREM方法研究了少量Au在Si（111）-Si_（111）-Au_（83）-Ag_（83）-Au_（83）-Ag表面上吸附所引起的各种表面相。

项目成果

T. Nagao, S. Ohuchi, Y. Matsuoka, and S. Hasegawa: "Morphology of ultrathin manganese silicide on Si(111)"Surface Science. 419. 134-143 (1999)

T. Nagao、S. Ohuchi、Y. Matsuoka 和 S. Hasekawa：“Si(111) 上超薄硅化锰的形态”表面科学。

H. Aizawa, M. Tsukada, N. Sato, and S. Hasegawa: "Asymmetric structure of the Si(111)-ィイD83ィエD8 X ィイD83ィエD8-Ag surface"Surface Science. 429. L509-L514 (1999)

H. Aizawa、M. Tsukada、N. Sato 和 S. Hasekawa：“Si(111)-D83D8-Ag 表面的不对称结构”表面科学 429。L509 -L514 (1999)

N.Sato,T.Nagao,S.Hasegawa: "Si(111)-√<3>x√<3>-Ag Surface at low temperatures : symmetry breaking and surface twin boundaries"Surface Science. 442. 65-73 (1999)

N.Sato、T.Nagao、S.Hasekawa：“Si(111)-√<3>x√<3>-Ag 低温表面：对称性破缺和表面孪晶边界”表面科学 442. 65-73 ( 1999）

T.Nagao,S.Ohuchi,Y.Matsuoka,S.Hasegawa: "Morphology of ultrathin manganese silicide on Si(111)" Surface Science. 419. 134-143 (1999)

T.Nagao，S.Ohuchi，Y.Matsuoka，S.Hasekawa：“Si（111）上超薄硅化锰的形态”表面科学。

K. Tsuchie, T. Nagao, and S. Hasegawa: "Structure of C60 layers on the Si(111)-ィイD83ィエD8 X ィイD83ィエD8-Ag surface"Phys. Review B. 60. 11131-11136 (1999)

K. Tsuchie、T. Nagao 和 S. Hasekawa：“Si(111)-D83D8-Ag 表面上的 C60 层的结构”Phys Review B. 60. 11131 -11136 (1999)