LASER-EXCITATION EFFECT ON OPTICAL ABSORPTION BAND DUE TO METAL-CLUSTERS IN IONIC CRYSTAL AFTER ELECTRON IRRADIATION

电子辐照后离子晶体金属团簇对光吸收带的激光激发效应

• 批准号: 03650008
• 负责人: INABE Katsuyuki
• 金额: $ 1.09万
• 依托单位: FACULTY OF TECHNOLOGY, KANAZAWA 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-03650008/
• 关键词: ELECTRON IRRADIATION; METAL CLUSTER; IONIC CRYSTAL; OPTICAL ABSORPTION; LASER EXCITATION; TIME RESOLVED METHOD; 強励起効果; 瞬間測光

This work is mainly focussed on sodium clusters (colloids) formed in NaCl single crystal after intense electron pulse irradiation and subsequent heat treatment. The Na cluster in NaCl gives a characteristic optical absorption band peaking at 2.10eV, which is believed to be composed of a number of component due to clusters of various sizes. The purpose of this work is to examine the 2.10eV band after intense excitation with laserlight in order to get an information of the components of the band. The work has been carried out according to the following program:(1) Production of Na clusters in NaCl with electron irradiation and heat treatment.(2) Analysis of Na cluster formation through optical absorption measurement.(3) Setup of optical excitation system and spectrum measuring one.(4) Investigation of the 2.10eV band after laser excitation.As for terms (1) and (2), electron irradiation was carried out using a LINAC at ISIR, Osaka university and optical absorption spectrum was measured at … More 100K after each treatment of the sample. Detailed analysis on the basis of Gaussian peak of each component of the spectrum has revealed new facts that the Na clusters may be formed from a complex of four F centers aggregation in a (111) plane (so called N_1 center), and the 2.10eV band is composed of two bands at the initial stage of the formation.As for terms (3) and (4), setup of intense excitation system was made with a Nd:YAG and DYE laser. Optical absorption spectrum was observed with time resolved method using a monochromator coupled with a CCD linear sensor. Measurements were carried out by changing the conditions; the exciting light intensity, the delay time from the excitation to the measurement, etc. The results were always negative. These results lead us to the conclusion that no effect of intense optical excition can be observed on the absorption band due to the Na clusters. This may indicate a remarkable result that the intense excitation effect on the absorption band due to the free electron is completely different from that to the localized ones, since saturation effect is observed with the same system for electron irradiated NaCl single crystal without heat treatment. Less

本工作主要研究了强电子脉冲辐照NaCl单晶后，经过热处理后形成的钠团簇（胶体）。NaCl中的Na团簇在2.10eV处有一个特征吸收带，它是由不同大小的团簇组成的。本工作的目的是研究激光强激发后的2.10eV带，以获得该带的成分信息。（1）电子辐照和热处理在NaCl中产生Na团簇。(2)通过光吸收测量分析Na团簇的形成。(3)光学激发系统和光谱测量系统的建立。(4)激光激发后的2.10eV带的研究。对于项（1）和（2），使用大坂大学ISIR的LINAC进行电子照射，并在2.10eV下测量光吸收光谱。 ...更多信息 100K，每次处理样品后。对谱线各分量的高斯峰进行了详细的分析，揭示了Na团簇可能是由四个F心在（111）面聚集形成的2.10eV带在形成初期由两个带组成。至于第（3）项和第（4）项，用Nd：YAG和DYE激光器建立了强激发系统。利用单色仪与CCD线性传感器耦合，用时间分辨方法观测了光吸收光谱。通过改变激发光强度、从激发到测量的延迟时间等条件进行测量，结果总是阴性。这些结果导致我们的结论是，没有强的光激发的影响，可以观察到的吸收带由于钠团簇。这可能表明一个显著的结果，即自由电子对吸收带的强烈激发效应与局域电子对吸收带的强烈激发效应完全不同，因为在相同的系统中，电子辐照NaCl单晶而不进行热处理时观察到饱和效应。少

项目成果

K.Inabe N.Takeuchi: "Initial Stage of Na-Cluster Formation in NaCl Crystal after Intense Electron Irradiation" Jpn.J.Appl.Phys.32. (1993)

K.Inabe N.Takeuchi：“强电子辐照后 NaCl 晶体中钠簇形成的初始阶段”Jpn.J.Appl.Phys.32。

K. INABE AND N. TAKEUCHI: "INITIAL STAGE OF Na-CLUSTER FORMION IN NaCl CRYSTAL AFTER INTENSE ELECTRON IRRADIATION" Jpn. J. Appl. Phys.Vol. 32.,. (1993)

K. Inabe 和 N. TAKEUCHI：“强电子辐照后氯化钠晶体中钠簇形成的初始阶段”Jpn。

Katsuyuki Inabe Shoichi Nakamura Toshio Kurobori Nozomu Takeuchi: "Initial Stage of NaーCluster Formation in NaCl after Intense Elelctron Pulse Irradiation" Japanese Journal of Applied Physics. 31. (1992)

Katsuyuki Inabe Shoichi Nakamura Toshio Kurobori Nozomu Takeuchi：“强电子脉冲照射后氯化钠中氯化钠簇形成的初始阶段”日本应用物理学杂志31。（1992）

K.Inabe N.Takeuchi: "Laser-Excitation Effect on Optical absorption Band in NaCl after Intense Electron Irradiation" Jpn.J,Appl.Phys.32. (1993)

K.Inabe N.Takeuchi：“强电子辐照后激光激发对 NaCl 中光学吸收带的影响”Jpn.J，Appl.Phys.32。

K. INABE AND N. TAKEUCHI: "LASER-EXCITATION EFFECT ON OPTICAL ABSORPTION BAND DUE TO METAL-CLUSTERS IN CRYSTAL AFTER ELECTRON IRRADIATION" Jpn. J. Appl. Phys.Vol. 32.,. (1993)

K. Inabe 和 N. TAKEUCHI：“电子辐照后晶体中金属簇对光吸收带的激光激发效应”Jpn。