Magnetic Resonance Study on Electronically Conducting Liquids

电子导电液体的磁共振研究

• 批准号: 01470003
• 负责人: NAKAMURA Yoshio
• 金额: $ 3.9万
• 依托单位: Hokkaido University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01470003/
• 关键词: ERS; NMR; Metal; Solvated; Amine; ERS; 低磁場ESR; 不対電子; アルカリ金属; アミン溶液; ERS; NMR; Metal; Solvated; Amine; ERS; 低磁場ESR; 不対電子; アルカリ金属; アミン溶液

The magnetic resonance is a very useful method to investigate the microscopic states of chemical species in liquids. This method, however, has a limit owing to the so-called skin effect, Which is inevitable in highly conducting samples. In particular, usual ESR apparatuses with high frequency (1-35MHz) give limited information on conducting liquids. In this project we will study the electronic states in some alkali metal-ammonia (amine) solutions by ESR and NMR methods, operating at the same frequency around 100 MHz. For this purpose we have set up a low-field ESR apparatus and combine it with an NMR apparatus already available.Our ESR apparatus is of CW type, the resonance frequency is 195MHz. The field sweeping is from 63 to 76 gauss, and the modulation frequency is 6 KHz. The probe head is made as to operate at low temperatures, form 170 to 250K. The experimental results for lithium-methylamine solutions are summarized as :(1) The intensity of the ESR spectra per unit amount of diss … More olved metal is not a constant, but increases with temperature and decreases with concentration of metal.(2) The apparent spin-spin relaxation time T_2^* of the electronic spins determined from the spectral width increases with increasing temperature and metal concentration.(3) The observed spectra symmetric up to 23 mole % metal wnere the solutions is metallic.In the second year of the project, we have constructed a low-field pulsed ERS apparatus, which can be used for samples with very narrow spectral width, as narrow as 0.02 gauss. We are now trying to prepare suitable samples for the apparatus.On the other hand, we have measured the electronic properties of some chalcogenide liquid semiconductors modified with thallium and bismuth. We have also measured the chemical potential of thallium and bismuth in molten chalcogenides. We are planning to measure the NMR spectra of these added elements, which have sufficient NMR sensitivity. The ERS of the conduction electrons in these molten semiconductors will be made as well. Less

磁共振是研究液体中化学物种的微观态的一种非常有用的方法。但是，由于所谓的皮肤效应，该方法具有限制，这在高度传导样品中是不可避免的。特别是，通常具有高频（1-35MHz）的ESR设备提供了有限的有关导电液体的信息。在这个项目中，我们将通过ESR和NMR方法研究某些碱金属氨（Amine）溶液中的电子状态，以相同的频率约为100 MHz。为此，我们已经建立了低场ESR设备，并将其与已经可用的NMR设备相结合。它的ESR设备是CW类型，共振频率为195MHz。射场扫描为63至76高斯，调制频率为6 kHz。探针头是在低温下运行的，形式为170至250k。总结为：（1）每单位单位量的ESR光谱的强度总结为：diss的ESR光谱的强度……更多的金属……更多的金属不是恒定的，但随着温度而增加，随着金属的浓度随温度而降低。（2）明显的旋转旋转旋转宽松时间t_2^*从光谱宽度上增加了频谱的浓度（33）浓度的浓度增加了（33）33的浓度（3 33）。摩尔％金属磨损溶液是金属的。在项目的第二年，我们构建了一个低场脉冲ERS设备，可用于光谱宽度非常狭窄的样品，狭窄至0.02高斯。现在，我们正在尝试为设备准备合适的样品。另一方面，我们测量了一些用thallium and Bismuth修饰的硫酸基因并液体液体半导体的电子特性。我们还测量了在熔融葡萄糖核化合物中硫菌和需要二氮的化学潜力。我们计划测量具有足够NMR敏感性的这些添加元素的NMR光谱。这些熔融半导体中的传导电子的ER也将制造。较少的