Dynamic Observation of Outermost Surface Layer Reactions by Metastable Electron Emission Microscope

亚稳电子发射显微镜动态观察最外表面层反应

• 批准号: 09440235
• 负责人: HARADA Yoshiya
• 金额: $ 9.02万
• 依托单位: Chiba University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09440235/
• 关键词: solid surface; electron spectroscopy; surface reaction; electron microscope; 単分子膜

In this study we tried to observe the adsorption and diffusion of molecules, and dynamic processes of two-dimensional reactions between molecules on a well-defined solid surface, using the metastable electron emission microscope (MEEM) recently developed at our laboratory. This microscope images electrons emitted from the solid surface by impact of metastable atoms by means of an electron lens system. The results of the study are as follows.(1) A COD camera was directly connected to the MCP detection part of the MAES apparatus. A new data analysis system combined with the camera enabled us to observe MEEM images sensitively by processing the images.(2) Substrates (surfaces of silicon single crystals, cleavage planes of graphite and MoS_2 crystals, diamond films, etc.) were cleaned by heating. The process of the cleaning was observed by LEED (low energy electron diffraction), EELS (electron energy loss spectroscopy) and MAES (metastable atom electron spectroscopy).(3) The samples of org … More anic compounds (phthalocyanines, PTCDA (perylene-tetracarboxy1ic- dianhydride), etc.) were deposited by vacuum sublimation onto the above substrates. The change of the films with the elapse of time and the diffusion process of molecules were observed by MEEM (giving PIES in the micro-local area and energy-filtered images) and LEEM (giving EELS in the micro-local area and energy-filtered images).(4) The similar observations as above were carried out by PIES (Penning ionization electron spectroscopy), ARUPS (angle-resolved ultraviolet photoelectron spectroscopy), and HREELS (high-resolution electron energy loss spectroscopy) on ordinary surface-analysis apparatuses.(5) Samples of two kinds (organic compound and metal such as In) were deposited onto the substrates. The two-dimensional reactions between the samples were observed.(6) On the basis of the above results, the reaction rate, the position of the reaction in the molecule, and dynamic process in the change of the electronic state were clarified. Less

在这项研究中，我们试图使用我们实验室最近开发的亚稳态电子发射显微镜（MEEM）来观察分子的吸附和扩散，以及分子在明确的固体表面上二维反应的动态过程。该显微镜通过电子透镜系统对亚稳态原子撞击固体表面发射的电子进行成像。研究结果如下：(1)将COD相机直接连接到MAES装置的MCP检测部分。新的数据分析系统与相机相结合，使我们能够通过处理图像来灵敏地观察MEEM图像。(2)通过加热对基底(硅单晶表面、石墨和MoS_2晶体解理面、金刚石薄膜等)进行清洗。通过LEED（低能电子衍射）、EELS（电子能量损失谱）和MAES（亚稳态原子电子能谱）观察清洗过程。（3）将有机阴离子化合物（酞菁、PTCDA（苝四羧基二酐）等）样品通过真空升华沉积在上面。 基材。通过MEEM（给出微局域中的PIES和能量过滤图像）和LEEM（给出微局域中的EELS和能量过滤图像）观察了薄膜随时间的变化和分子的扩散过程。（4）PIES（彭宁电离电子能谱）、ARUPS（角分辨紫外光谱）也进行了与上述类似的观察。 (5)将两种样品(有机化合物和In等金属)沉积在基底上。观察了样品间的二维反应。(6)根据上述结果，阐明了反应速率、反应在分子中的位置以及电子态变化的动态过程。较少的

项目成果

A.Abuduaini: "Observation of Outermost Surface Layer of 4-Mercaptohydrocynamic Acid Self-Assembled Film on Au(111)by PIES" Appl.Surface Sci.(印刷中).

A.Abuduaini：“通过 PIES 对 Au(111) 上 4-巯基氢氰酸自组装膜的最外表面层进行观察”Appl.Surface Sci.（印刷中）。

S.Kera: "Penning Ionization Electron Spectroscopy of Titanyl Phthlocyanine Ultrathin Films : Electronic State and Molecular Orientaion" J.Electron Spectrosc.Relat.Phenom.88-91. 885-889 (1998)

S.Kera：“钛氧基酞菁超薄膜的彭宁电离电子能谱：电子态和分子取向”J.Electron Spectrosc.Relat.Phenom.88-91。

A.Abuduaini: "Observation of Outermost Surface Layer of 4-Mercaptohydrocynamic Acid Self-Assembled Film on Au(111)by PIES" Appl.Surface Sci.(in Press).

A.Abuduaini：“通过 PIES 对 Au(111) 上 4-巯基氢氰酸自组装膜的最外表面层进行观察”Appl.Surface Sci.（正在出版）。

Y.Azuma: "Chracterization of Thin Films of Chloroaluminum Phthalocyanine on MoS_2:HREELS,LEET and PIES Study" Thin Solid Films. 327-329. 303-307 (1998)

Y.Azuma：“MoS_2 上氯铝酞菁薄膜的表征：HREELS、LEET 和 PIES 研究”固体薄膜。

Y.Azuma: "High Resolution Electron Energy Loss Spectroscopy of Chloroaluminum Phthalocyanine Ultra-Thin Films" J.Electron Spectrosc.Relat.Phenom.88-91. 881-884 (1998)

Y.Azuma：“氯铝酞菁超薄膜的高分辨率电子能量损失光谱”J.Electron Spectrosc.Relat.Phenom.88-91。