Counting correlation analysis of internal conversion electrons excited by nuclear-resonant synchrotron radiation and its application to surface study

核共振同步辐射激发内转换电子计数相关分析及其在表面研究中的应用

• 批准号: 07455020
• 负责人: OKANO Tatsuo
• 金额: $ 4.86万
• 依托单位: Institute of Industrial Science, University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455020/
• 关键词: nuclear resonant excitation; internal conversion electron; time-resolved spectroscopy; synchrotron radiation; surface; photoemission; Fe; correlation analysis; 内部転換; 電子分光; 核共鳴放射光励起; 内部転換電子放射; 時間分解電子分光; 表面磁性; 超微細構造; 鉄同位体核; 回転楕円ミラー型電子分光器; 荷

The aim of this research project is detection of internal-conversion electrons excited by nuclear resonant synchrotron radiation and its application to advanced studies of solid surfaces.The first step of this project was a development of time-resolved electron energy analyzer. We have designed two kind of such spectrometer. One was based on a retarding field analyzer which consists of three stage ellipsoidal mesh grid. The special feature of this analyzer is a wide detection angle most preferable to the very weak electron signal. We have make use of an avalanche phot-diode (APD) to measure electrons. The signal to noise ratio of APD was superior to conventional channel-type electron multiplier by several hundreds. The other type is a hemispherical deflector-type analyzer combined with a specially designed streak-camera. This system is for a angular-resolved measurement with nice time-resolution. Maximum time resolution is 20ps.The measurement of internal-conversion electron was made at NE-3 beamline in KEK.We have successfully measured a tail of electron emission after irradiation of synchrotron radiation. The sample of this measurement was Fe_2BO_<3.> crystal. To elucidate the nature of delayd emission and new surface phenomena, the measurement of delayd electron emission is continued.

本研究计划的目的是探测核共振同步辐射激发的内转换电子，并将其应用于固体表面的高级研究，该计划的第一步是开发时间分辨电子能量分析仪。我们设计了两种这样的光谱仪。一种是基于三级椭球网格的减速场分析仪。该分析仪的特点是宽检测角，最适合于非常微弱的电子信号。我们利用雪崩光电二极管（APD）来测量电子。APD的信噪比比传统的通道式电子倍增器高出上级几百倍。另一种类型是半球形偏转器型分析仪，与专门设计的条纹相机相结合。该系统是一种具有良好时间分辨率的角分辨测量系统。最大时间分辨率为20 ps。在KEK NE-3束线上进行了内转换电子的测量，成功地测量了同步辐射照射后的电子发射尾部。本测量的样品为<3.>Fe_2BO_2晶体。为了阐明延迟发射的本质和新的表面现象，继续进行延迟电子发射的测量。

项目成果

K.Hata, H.Shigekawa, T.Okano: "The formation mechanism of step bunching on vicinal GaAs(001) annealed in AsH3 and H_2 ambient" J.Vac.Sci.Technol.B. (掲載予定). (1997)

K.Hata、H.Shigekawa、T.Okano：“在 AsH3 和 H_2 环境中退火的邻位 GaAs(001) 的阶梯聚束的形成机制”J.Vac.Sci.Technol.B（即将出版）。 ）

K.Hata: "Modeling of step bunching formed on vicinal GaAs (001) annealed in AsH_3 and H_2 ambient" Physical Review B. (to be published).

K.Hata：“在 AsH_3 和 H_2 环境中退火的邻位 GaAs (001) 上形成的阶梯聚束的建模”Physical Review B.（即将出版）。

K.Hata.H.SHigekawa.T.Okano: "Modeling of step bunching formed on vicinal GaAs(001) annealed in AsH3 and hydrogen ambient" Phys.Rev.B. (掲載予定). (1997)

K.Hata.H.SHIgekawa.T.Okano：“在 AsH3 和氢气环境中退火的邻位 GaAs(001) 上形成的阶梯聚束模型”Phys.Rev.B（即将出版）。

加藤 宏、岡野 達雄 他: "回転ミラー型電子分光器の内部転換電子放射への応用" 生産研究. (掲載予定). (1997)

Hiroshi Kato、Tatsuo Okano 等：“旋转镜电子能谱仪在内转换电子发射中的应用”生产研究（待出版）。

K.Hata,H.SHigekawa.T.Okano: "Modeling of step bunching formed on vicinal GaAs(001)annealed in AsH3 and hydrogen ambient" Phys.Rev.B. (掲載予定). (1997)

K.Hata、H.SHIgekawa.T.Okano：“在 AsH3 和氢气环境中退火的邻位 GaAs(001) 上形成的阶梯聚束的模型”Phys.Rev.B（即将出版）。