Experimental Study on Creation and Decay Processes of Excitons in Rare Gas Clusters

稀有气体团簇中激子产生与衰变过程的实验研究

• 批准号: 05640458
• 负责人: HIRAYAMA Takato
• 金额: $ 1.41万
• 依托单位: Gakushuin 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: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640458/
• 关键词: rare gas cluster; exciton; electron affinity; electron energy loss spectroscopy; supersonic cluster beam source; 電子エネルギー損失分光

During the term of this project, we have designed and constructed and apparatus for the study of the electronic excitation processes in rare-gas clusters using the electron energy loss spectroscopy, and have obtained some preliminary results for the excitonic excitation process in Kr cluster. The experimental setup consists of a vacuum chamber including a pumping system, an electron energy loss spectrometer, 2 types of supersonic cluster beam source, and a cluster ion detector for the measurement of the cluster size distribution.Using the cluster beam source using a differential cryo pumping system, we have measured the electron energy loss spectra for Kr_n cluster (n=500-600), at the electron impact energy of 100eV and the observation angle of 0 deg. Creation of the surface excition in the cluster, which corresponds to the excitation of 4p^55s state in an isolated atom, has been clearly observed.Our plan from the next year is as follows,(1) Measurement of the excitonic excitation spectra for Ne and Ar clusters using a conventional type cluster beam source, which has been constructed recently.(2) Confirmation of the existence of stable negatively charged Kr and Xe clusters, whose electron affinities are known to be negative in atoms, and positive in solids, which suggests the change of the sign of electron affinity in clusters.

在本项目期间，我们设计并建造了一套利用电子能量损失谱研究稀有气体团簇中电子激发过程的装置，并对Kr团簇中的激子激发过程进行了初步研究。实验装置包括一个带抽气系统的真空室、一台电子能量损失谱仪、两种超声团簇束源和一台测量团簇尺寸分布的团簇离子探测器，我们用差分低温抽气系统的团簇束源测量了Kr_n团簇的电子能量损失谱（n=500-600），电子轰击能量为100 eV，观察角为0 °。从明年开始，我们的工作计划如下：（1）用新近研制的常规型团簇束源测量Ne和Ar团簇的激子激发谱。(2)证实了稳定的带负电荷的Kr和Kr团簇的存在，它们的电子亲合势在原子中是负的，在固体中是正的，这表明团簇中电子亲合势的符号发生了变化。

项目成果

T.Hirayama: "Excitonic energy transfer process in Ne-Kr alloy studied by photon stimulated desorption of metastable atoms" J.Electr.Spectr.Rel.Phen.(in press). (1996)

T.Hirayama：“通过亚稳态原子的光子激发解吸研究氖氪合金中的激子能量转移过程”J.Electr.Spectr.Rel.Phen.（出版中）。

T.Hirayama: "Excitonic energy transfer process in Ne‐Kr alloy studied by photon stimulated desorption of metastable atoms." J. Electr. Spectr. Rel. Phen.印刷中. (1996)

T. Hirayama：“通过亚稳态原子的光子激发解吸研究激子能量转移过程”，J. Rel Phen。

T.Hirayama: "Supersonic cluster beam source using a differential cryo pumping system" Rev.Sci.Instrum.64. 962-965 (1993)

T.Hirayama：“使用差动低温泵系统的超音速簇束源”Rev.Sci.Instrum.64。

I.Arakawa: "Angular and Kinetic Energy Distributions of the Desorption of Ne Metastable Induced by Excitons at the smface of Solid Ne" Nucl.Instrum.Meth.Phys.Res.B. 印刷中. (1995)

I.Arakawa：“固体氖表面激子引起的氖亚稳态解吸的角能和动能分布”Nucl.Instrum.Meth.Phys.Res.B 出版中。

I.Arakawa: "Angular and kinetic energy distributions of the desorption of Ne metastable induced by excitons at the surface of solid Ne" Nucl.Instrum.Meth.Phys.Res.B101. 195-199 (1995)

I.Arakawa：“固体氖表面激子引起的氖亚稳态解吸的角能和动能分布”Nucl.Instrum.Meth.Phys.Res.B101。