Development of collisional detachment spectrometer and its application to the study of cluster-surface interaction

碰撞脱离光谱仪的研制及其在团簇-表面相互作用研究中的应用

• 批准号: 03453014
• 负责人: ACHIBA Yohji
• 金额: $ 4.42万
• 依托单位: Tokyo Metropolitan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 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/en/grant/KAKENHI-PROJECT-03453014/
• 关键词: carbon cluster; solid surface; collision; electron emission; negative ion; fullerene; isomer; RHEED; RHEED; 半導体クラスタ-; レ-ザ-蒸発法; 飛行時間型質量分析; 電子分光; フラ-レン

Size selected semiconductor cluster ions were examined on the collisional electron emission at solid surface as a function of incident kinetic energy. Two different mechanisms were found below 1 keV collision energy. Electron emission occurring at high energy (>300 ev) is totally governed by velocity of the incident cluster ions. The electron emission at low collision energy, on the other hand, is considerably dependent on the molecular structures of the carbon clusters, i. e., linear chain, monocyclic ring, and hollowclosed-cage structures. The latter process is a new phenomenon which may be closely related with a collisional electron detachment of negative carbon cluster ions.Then, carbon cluster containing from two to 60 atoms were examined in detail on the collision with the solid surface. Since the detachment efficiency significantly depends on the structure of clusters, versatile information of the unknown structures of carbon clusters may be obtained. Actually, we deduced from the present study, the structure of C_<60> produced by laser vaporization should not be hollowclosed-cage.

研究了尺寸选定的半导体团簇离子在固体表面的碰撞电子发射与入射动能的关系。在1keV以下，发现了两种不同的机制。在高能(&gt；300 eV)发生的电子发射完全由入射团簇离子的速度决定。另一方面，低碰撞能下的电子发射很大程度上依赖于碳团簇的分子结构，即直链、单环和中空的闭合笼形结构。后者是一个新的现象，可能与负碳团簇离子的碰撞电子剥离密切相关。然后，详细研究了含2-60个原子的碳团簇与固体表面的碰撞。由于碳团簇的脱附效率与团簇结构密切相关，因此可以获得碳团簇未知结构的多种信息。实际上，我们从目前的研究中推断，激光蒸发产生的C_&lt；60&gt；的结构不应该是中空的封闭笼形结构。

项目成果

Y.Achiba: "A hypothet:cal growth of carbon 5/6 network" Naterial Science and Engineerirg B,in press.

Y.Achiba：“假设：碳 5/6 网络的生长”，《材料科学与工程 B》，出版中。

H.Shiromaru, T.Moriwaki, C.Kittaka and Y.Achiba: "Collisional electron emission at solid surfaces induced by mass selected negative cluster ions" Z.Phyd.D.20. 141 (1991)

H.Shiromaru、T.Moriwaki、C.Kittaka 和 Y.Achiba：“由质量选择的负簇离子引起的固体表面碰撞电子发射”Z.Phyd.D.20。

T.Moriwaki: "Dynamics of the clusteーsurface interaction:Collisional detachment of size selected carbon negative cluster ions." Proc.Int.Symp.on the Physics and Chemistry of Finite Systems:From Clusters to Crystals.the NATO ASI series.

T.Moriwaki：“簇表面相互作用的动力学：尺寸选定的碳负簇离子的碰撞分离。Proc.Int.Symp.关于有限系统的物理和化学：从簇到晶体。NATO ASI 系列。”

T.Kato: "Electron absorption spectra of the radical anions and cations of fullerenes:C_<60> and C_<70>." Chem.Phys.Lett.180. 446-450 (1991)

T.Kato：“富勒烯自由基阴离子和阳离子的电子吸收光谱：C_<60> 和 C_<70>。”

T.Moriwaki: "Dynamics of cluster-surfaie in Teracton:Euidenco of structual Isomers of C<-/60>" Z.Phys.Chem.

T.Moriwaki：“Teracton 中簇表面的动力学：C<-/60> 结构异构体的 Euidenco”Z.Phys.Chem。