A creation of cryogenic electron emission microscope and the applications to solid surfaces.

低温电子发射显微镜的创建及其在固体表面的应用。

• 批准号: 11354003
• 负责人: MASUDA Shigeru
• 金额: $ 22.17万
• 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 (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11354003/
• 关键词: electron emission microscope; electron spectroscopy; electronic state; metastable atom; solid surface

A new electron emission microscope using photons, low-energy electrons, and metastable atoms as an excitation source has been developed to study spatiotemporal phenomena occurring at a solid surface. The metastable atoms such as He*(2^3S) were produced by cold-discharge and the beam intensity was attained to 〜10^16 He(2^3S) atoms s^<-1> sr^<-1>. The electrostatic and magnetic lens systems were designed at our laboratory for the low-energy electron gun and electron emission microscope based on a computer simulation program. The spatial resolution of the microscope thus constructed is 100 nm at present and will be improved by beam adjustment. We also developed a sample cooling system from some K to 1000 K to observe images of samples held at low temperature. Further we have observed PEEM images of stoichiometric NiO and chemisorbed oxygen during heating of the oxygen-exposed Ni(100), indicating that the desorption of the oxide layer proceeds inhomogeneously in space.

利用光子、低能电子和亚稳原子作为激发源，研制了一种新型的电子发射显微镜，用于研究固体表面的时空现象。冷放电产生了He*(2^3S)等亚稳原子，束流强度达到~ 10^16个He（2^3S）原子s^<-1> sr^<-1>。基于计算机仿真程序，在实验室设计了低能电子枪和电子发射显微镜的静电透镜系统和磁透镜系统。目前所构建的显微镜的空间分辨率为100 nm，并将通过光束调节来提高。我们还开发了一个样品冷却系统，从一些K到1000 K，以观察样品在低温下的图像。此外，我们还观察了在加热暴露于氧的Ni（100）过程中化学计量NiO和化学吸附氧的PEEM图像，表明氧化层的解吸在空间上是不均匀的。

项目成果

S.Masuda, R.Suzuki, M.Aoki, Y.Morikawa, R.Kishi, M.Kawai: "Local electron distribution of CO absorbed on Ni(100) and Ni(111) surfaces studied by metastable atom electron spectroscopy(in Japanese)"Journal of The Surface Science Society of Japan. 22. 443-44

S.Masuda、R.Suzuki、M.Aoki、Y.Morikawa、R.Kishi、M.Kawai：“通过亚稳态原子电子能谱研究了 Ni(100) 和 Ni(111) 表面吸收的 CO 的局域电子分布（in

A.Abdureyim, S.Kera, H.Setoyama, K.K.Okudaira, R.Suzuki, S.Masuda, N.Ueno, Y.Harada: "Observation of outemost surface layer of 4-mercaptohydrocynnamic acid self-assembled film on Au(111)by Penning iorizaion electron spectroscopy"Applied Surface Science. 1

A.Abdureyim，S.Kera，H.Setoyama，K.K.Okudaira，R.Suzuki，S.Masuda，N.Ueno，Y.Harada：“Au（111）上4-巯基氢肉桂酸自组装膜最外层的观察

S.Hino et al.: "Ultraviolet photoelectron spectra of metallofullerenes, two Ca@C82 isomers"Chemical Physics Letters. 337. 65-71 (2001)

S.Hino 等人：“金属富勒烯的紫外光电子光谱，两种 Ca@C82 异构体”《化学物理快报》。

M.Aoki, H.Taoka, T.Kamada, S.Masuda: "Lodal electronic states of oxygan on a Ni(111) surface studied by metastable atom electron spectroscopy"Journal of Electron Spectroscopy and Related Phenomena. 114-116. 507-512 (2001)

M.Aoki、H.Taoka、T.Kamada、S.Masuda：“通过亚稳态原子电子能谱研究 Ni(111) 表面上氧的 Lodal 电子态”电子能谱和相关现象杂志。

R.Suzuki, H.Taoka, M.Aoki, S.Masuda, Y.Morikawa: "Local electronic states in the topmost surface layer probed by metastable atom electron spectroscopy, N_2 absorbed and condensed on Ni(111)"Physical Review B. 65. 035416 (2002)

R.Suzuki、H.Taoka、M.Aoki、S.Masuda、Y.Morikawa：“通过亚稳态原子电子能谱探测最顶层表面的局域电子态，N_2 吸收并凝结在 Ni(111) 上”Physical Review B.