A New Time Resolved Electron Spin Resonance with Balanced Double Cavities

一种新的平衡双腔时间分辨电子自旋共振

基本信息

  • 批准号:
    09555026
  • 负责人:
  • 金额:
    $ 5.44万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
  • 财政年份:
    1997
  • 资助国家:
    日本
  • 起止时间:
    1997 至 1999
  • 项目状态:
    已结题

项目摘要

In this research project we have developed a new instrument to realize a time resolved (TR) ESR (EPR) measurement in semiconductor solids such as titanium oxide for which measurement had been impossible until now. Previously, we could only observe extremely long lived radicals formed at the semi-conductor surface with CWESR spectroscopy on steady-state photo illumination. With this new instrument, we will be able to detect a short lived radicals by TRESR In conventional TRESR methods, a sudden change in the dielectric constant, which is induced by short-lived caniers formed on laser pulse in semiconductor solids, disturbs the sample cavities to reduce their sensitivity (Q-value) and to give large transient signals due to the dynamic dielectric change (DDC). We use two sample cavities ; one is for sample and the other is for reference. Two microwave signals coming from either of two cavities are mixed to be cancel out in the microwave circuit by phase matching technique. The sample cavity is located in the external magnetic field which is scanned to obtain TRESR spectra In the experiment with titanium oxide micro particle, we could lower the DDC signal to be less than 1/% and therefore the total sensitivity increased about as 1OO time large as before. We added the extemal automatic tequency controller (AFC) to exclude the effect of instability of cavities to obtain low-noise signal. Until now, the sensitivity of this instrument is too low to succeed in TRESR measurement for titanium oxide which is our initial purpose. In principle. however, it is clear that this method is generally applicable to semiconductor solids to detect short-lived paramagnetic species formed from trapping states existing in the band gap. This apparatus provides a new method which can be generally used for the detection of paramagnetic centers (defects, impurities, etc.) formed in semiconductor solids.
在这个研究项目中,我们开发了一种新的仪器来实现半导体固体(如氧化钛)的时间分辨(TR) ESR (EPR)测量,这是迄今为止不可能测量的。以前,我们只能用CWESR光谱在稳态光照射下观察到半导体表面形成的极长寿命的自由基。在传统的TRESR方法中,由激光脉冲在半导体固体中形成的短寿命裂纹引起的介电常数的突然变化会干扰样品腔,从而降低它们的灵敏度(q值),并由于动态介电变化(DDC)而产生大的瞬态信号。我们使用了两个样品腔;一个供样品,一个供参考。在微波电路中,通过相位匹配技术将来自两个腔中的任意一个腔的两个微波信号混合并抵消。在氧化钛微粒子实验中,我们可以将DDC信号降低到小于1/%,从而使总灵敏度比以前提高了约100倍。为了排除空腔不稳定性的影响,我们增加了外部自动频率控制器(AFC),以获得低噪声信号。到目前为止,该仪器的灵敏度太低,无法成功测量氧化钛的TRESR,这是我们最初的目的。原则上。然而,很明显,这种方法通常适用于半导体固体,以检测存在于带隙中的捕获态形成的短寿命顺磁性物质。该仪器为半导体固体中形成的顺磁中心(缺陷、杂质等)的检测提供了一种新方法。

项目成果

期刊论文数量(70)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
M-H.Liu et al: "Novel Photo-recording Langmuir-Blodgett Films."Advanced Materials. 9・14. 1099-1101 (1997)
M-H.Liu 等人:“新颖的照片记录 Langmuir-Blodgett 胶片”。《高级材料》9・14(1997 年)。
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    0
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  • 通讯作者:
K.Kamada et al: "Molecular Dynamics of Thiophene Homologues Investigate by Femtosecond Optical Kerr Effect and Low Frequency Raman Scattering Spectroscopies."The Journal of Chemical Physics. 109・24. 10948-10957 (1998)
K. Kamada 等人:“通过飞秒光学克尔效应和低频拉曼散射光谱研究噻吩同系物的分子动力学”,《化学物理杂志》10948-10957。
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    0
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H.Imahori et al: "Organic Photoelectrochemical Cell Mimicking Photoinduced Multistep Electron Transfer in Photosynthesis : Interfacial Structure and Photoelectrochemical Properties of Self-Assembled Monolayers of Porphyrin-Linked Fullerenes on Gold Electr
H.Imahori 等人:“有机光电化学电池模拟光合作用中的光诱导多步电子转移:金电子上卟啉连接富勒烯自组装单分子层的界面结构和光电化学性质
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    0
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T.Kluge et al: "Concentration and Molecular Weight Dependence of the Quenching of Ru(bpy)_3^<2+> by ferricyanide in Aqueous Solutions of Synthetic Hyaluronan."Macromolecules. 33・2. 375-381 (2000)
T. Kluge 等人:“合成透明质酸水溶液中铁氰化物淬灭 Ru(bpy)_3^<2+> 的浓度和分子量依赖性”(2000)。
  • DOI:
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    0
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Y.Nosaka et al: "Electron Spin Echo Investigation for Radicals Produced on ZnS Semiconductor Photocatalysts."Chem. Lett.. 1997. 661-662 (1997)
Y.Nosaka 等人:“ZnS 半导体光催化剂上产生的自由基的电子自旋回波研究”。
  • DOI:
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  • 影响因子:
    0
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USHIDA Kiminori其他文献

USHIDA Kiminori的其他文献

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{{ truncateString('USHIDA Kiminori', 18)}}的其他基金

Development of a novel evaluation system for the barriers against drug delivery in stroma and mucus
开发一种新型评价系统,用于基质和粘液中药物输送的障碍
  • 批准号:
    24650282
  • 财政年份:
    2012
  • 资助金额:
    $ 5.44万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Physical Chemistry in Mucus
粘液的物理化学
  • 批准号:
    21550030
  • 财政年份:
    2009
  • 资助金额:
    $ 5.44万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Development of Diagnosis Method for Early Stage of Osteoarthritis using Fluorescence Correlation Spectroscopy
利用荧光相关光谱技术开发骨关节炎早期诊断方法
  • 批准号:
    17300166
  • 财政年份:
    2005
  • 资助金额:
    $ 5.44万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Dissociation-Recombination Dynamics of Iodine Molecule in Super Fluid State Helium
超流态氦中碘分子的解离-重组动力学
  • 批准号:
    10640506
  • 财政年份:
    1998
  • 资助金额:
    $ 5.44万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

相似海外基金

Magnetic Semiconductor Solid Solutions
磁性半导体固体解决方案
  • 批准号:
    1607905
  • 财政年份:
    2016
  • 资助金额:
    $ 5.44万
  • 项目类别:
    Standard Grant
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