Angle-Resolved Ultraviolet Photoemission Studies on Low-Temperature Adsorption Stales

低温吸附塔的角分辨紫外光电发射研究

• 批准号: 03640308
• 负责人: SAKISAKA Yasuo
• 金额: $ 1.15万
• 依托单位: Hirosaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03640308/
• 关键词: Angle-resolved ultraviolet photoemission spectroscopy; Single crystral surface; Adsorbed surface; Band structure; 金属単結晶表面

(1) Two-dimensional dispersion of the H Is-derived energy bands of the Fe(110)-(2X1)H and (3X1)H surfaces was studied by angle-resolved photoemission spectroscopy with synchrotron radiation. For both phases, the effective mass (m^*/m) near GAMMA was found to be -1.7 In the [110] azimuth whereas it is considerably small (-0.4) in the [001] azimuth. The origin for the abnormally small effective mass is not clear at present(2) CO chemisorption on Fe(110) at 80K was studied by angle-resolved photoemission spectroscopy. It was found that the CO axis orientation with respect to the Fe (110) surface depends on coverage and that the CO 4sigma-metal 3d hybridization effect can not be neglected for light transition-metal surfaces.(3) The change in the electronic structure of W(110) surface caused by the hydrogen-induced reconstruction was studied by angle-resolved photoemission spectroscopy. The adsorbed hydrogen becomes closer to the W(110) surface after reconstruction, leading to the stabilization of the system by the increase of hybridization between H and W atoms.(4) The valence-hand structure of an organic superconductor kappa-(BEDT-TTF)_2Cu(NCS)_2 was studied by angle-resolved photoemission spectroscopy. Two characteristic structures were observed at 7.5 and 11.5 eV below the Fermi level, in agreement with the result of a molecular-orbital calculation. However,the Fermi edge was not observed.(5) We tried but failed in cleaning a Gd(0001) surface.(6) The cleaning procedure is now carried out for a Cr(100) surface.

(1)用同步辐射角分辨光电子能谱研究了Fe（110）-（2X 1）H和（3X 1）H表面H Is能带的二维色散。对于这两个相位，在[110]方位角，Gamma附近的有效质量（m^*/m）为-1.7，而在[001]方位角，它相当小（-0.4）。（2）用角分辨光电子能谱研究了80 K时CO在Fe（110）表面的化学吸附。发现CO轴相对于Fe（110）面的取向依赖于覆盖度，对于轻过渡金属表面，CO 4 σ-金属3d杂化效应不可忽略. (3)利用角分辨光电子能谱研究了氢致重构引起的W（110）表面电子结构的变化。吸附的氢在重构后更靠近W（110）面，通过增加H和W原子间的杂化作用使体系稳定。(4)用角分辨光电子能谱研究了有机超导体kappa-（BEDT-TTF）_2Cu（NCS）_2的价手结构。在费米能级以下7.5和11.5 eV处观察到两种特征结构，与分子轨道计算的结果一致。然而，没有观察到费米边缘。(5)我们尝试过清洗Gd（0001）表面，但失败了。(6)现在对Cr（100）表面进行清洁程序。

项目成果

T.Maruyama: "AngleーResolved Photoemission Study of Hydrogen Adsorbed on Fe(110)" Surface Science. 253. 147-156 (1991)

T.Maruyama：“Fe(110) 上吸附的氢的角分辨光发射研究”表面科学 253. 147-156 (1991)

Y. Aiura: "Hydrogen-Induced-Reconstruction of W(110) Surface Studied by Angle-Resolved Photoemission Spectroscopy" Surface Sci.

Y. Aiura：“通过角分辨光电发射光谱研究的 W(110) 表面的氢诱导重建”表面科学。

M. Yoshimura: "Electronic Structure of the Organic Superconductor kappa-(BEDT-TTF)_2Cu(NCS)_2 Studied by Angle-Resolved Photoemission Spectroscopy" J pn. J. Appi. Phys.31. 1341-1342 (1992)

M. Yoshimura：“通过角分辨光电发射光谱研究有机超导体 kappa-(BEDT-TTF)_2Cu(NCS)_2 的电子结构”J pn。

Y. Sakisaka: "Nd-Ce-Cu-O Valence Band Photoemission Measurements-including resonant and angle-resolved photoemission spectroscopy-." J. Electron Spectroscopy.

Y. Sakisaka：“Nd-Ce-Cu-O 价带光电发射测量 - 包括共振和角分辨光电发射光谱 -”。

T. Maruyama: "CO on Fe(110): An Angle-Resolved Photoemission Study" Phys. Rev. B.

T. Maruyama：“Fe(110) 上的 CO：角分辨光电子发射研究”