Trial Manufacture of A Pulsed High Frequency EPR Machine

脉冲高频乙丙橡胶机的试制

• 批准号: 13354008
• 负责人: YAMAUCHI Seigo
• 金额: $ 29.45万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13354008/
• 关键词: High frequency EPR; Time-Resolved EPR; Pulsed EPR; W-band EPR; Photo-Chemical Reaction; Reaction Intermediate; Excited Multiplet State; ELDOR; 電子スピン共鳴; 装置開発; 二次元ESR; 三重項-ラジカル対; ELDOR; 励起三重項状態; 電子スピン共鳴法; ESR装置; 金属錯体; 電子励起状態

We have succeeded in manufacture of pulsed high frequency W-band (95 GHz) EPR machine for the first time in Japan, which is useful for measurements of Fourier transform EPR, Electron Spin Echo envelop-modulation EPR, spin relaxations, and Electron-electron Double Resonance (ELDOR) EPR. The followings are summaries of this research.1.For the optical measurement, the fiber can be movable and is put into a sample tube, which makes an excitation efficiency increase by a factor of more than 5 and makes the measurement of de-gassed samples possible.2.The bandwidth of the pre-amplifier is exchanged from an original 6 MHz to 150 MHz, which makes time-resolution of this machine change from 150 ns to 10 ns.3.To find out a resonance frequency in the cavity, the frequency sweep and two-phase detection devices are made.4.The maximum microwave power is 250 mW, which is fifty times higher than commercial one and makes a short pulse of less than 50 ns possible.5.By using Mn(II) ion, we have succeeded in observation of a free induction decay (FID) signal at the W-band. The 20 ns pulse width can be realized as the 90 degree pulse, which is much shorter than the commercial one (150 ns).6.The ELDOR experiment using two different frequencies is also possible to perform with this.

我们在日本首次成功地制造了脉冲高频W波段（95 GHz）EPR机，它可用于测量傅里叶变换EPR、电子自旋回波调制EPR、自旋弛豫和电子-电子双共振（ELDOR）EPR。本研究的主要内容如下：1.在光学测量中，光纤可以移动，并被放入样品管中，使激发效率提高了5倍以上，使脱气样品的测量成为可能; 2.前置放大器的带宽由原来的6 MHz变为150 MHz，3.为了找到谐振腔的谐振频率，制作了扫频和两相检测装置4.最大微波功率为250 mW，5.利用Mn（II）离子，我们成功地观测到了W波段的自由感应衰减（FID）信号。20 ns的脉冲宽度可以实现为90度脉冲，这比商业脉冲（150 ns）短得多。6.使用两个不同频率的ELDOR实验也可以用它来执行。

项目成果

Y.Ohba, S.Yamauchi: "Determination of Relative Sign of g-factors by Two-dimensional Pulsed EPR Nutation Spectroscopy"Mol. Phys.. (in press).

Y.Ohba，S.Yamauchi：“通过二维脉冲 EPR 章动光谱测定 g 因子的相对符号”Mol。

Structures and Electronic States of Photoexcited States in a System of Two Nitroxide Radicals Linked Fullerene Studied by Two Dimensional Pulsed Nutation and Time-Resolved Electron Paramagnetic Resonance Spectroscopy

二维脉冲章动和时间分辨电子顺磁共振波谱研究两个氮氧自由基连接富勒烯体系中光激发态的结构和电子态

• 发表时间: 2004
• 期刊: Appl.Magn.Reson. 24
• 作者: Y.Ohba et al.

Time-resolved (TR) EPR Study of the First Excited Triplet States of Dibenzocycloheptadienylidene and Diphenylmethylene derivatives

二苯并亚环庚二烯和二苯基亚甲基衍生物第一激发三重态的时间分辨 (TR) EPR 研究

• 发表时间: 2003
• 期刊: J. Phys. Chem A. 107・10
• 作者: Tadaaki Ikoma;Minoru Yamaji;Kimio Akiyama;Fuyuki Ito;Fuyuki Ito;Hiroshi Ikeda;Toshinari Ogiwara;Yasuhiro Kobori;Tadaaki Ikoma;Minoru Yamaji;Kimio Akiyama;Fuyuki Ito;Fuyuki Ito;Hiroshi Ikeda;Toshinari Ogiwara;Yasuhiro Kobori;Kimio Akiyama;Yamaji Minoru;Tadaaki Ikoma;Fuyuki Ito;Fuyuki Ito;Yasuhiro Kobori;Kimio Akiyama;Hiroshi Ikeda;Yasuhiro Kobori;Hiroshi Ikeda;Tomoaki Yago;Hiroshi Ikeda;Yasuhiro Kobori;Hiroshi Ikeda;Tomoaki Yago;Hiroshi Ikeda;Yasuhiro Kobori;Hiroshi Ikeda;Toyonobu Usuki;Tomoaki Yago;Kimio AKIYAMA
• 通讯作者: Kimio AKIYAMA

Recent Developments in Studies of Electronic Excited States by Means of Electron Paramagnetic Resonance Spectroscopy

电子顺磁共振波谱研究电子激发态的最新进展

• 发表时间: 2004
• 期刊: Bull.Chem.Soc.Jpn. 77
• 作者: S.Yamauchi

Substrate specificities of Deuterolysin from Aspergillus oryzae and Electron Paramagnetic Resonance Measurement of Cobalt-substituted Deuterolysin

米曲霉半溶素的底物特异性及钴取代半溶素的电子顺磁共振测定

• 发表时间: 2003
• 期刊: Biosci, Biotechnol.Biochem. 67(2)
• 作者: Y.Doi et al.