2020 Fiscal Year Final Research Report
Development of advanced NQR
| Project/Area Number |
18H01941
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 32010:Fundamental physical chemistry-related
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
野田 泰斗 京都大学, 理学研究科, 助教 (00631384)
武田 和行 京都大学, 理学研究科, 准教授 (20379308)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | 核四極子共鳴法 |
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| Outline of Final Research Achievements |
When compared with Nuclear Magnetic Resonance (NMR), methodological development of Nuclear Quadrupolar Resonance (NQR) has not yet been fully achieved. The aim of this research is to provide a rapid method for finding NQR resonances and to examine double-resonance NQR. For the former, we presented an efficient, two-step NQR protocol by using a non-adiabatic, frequency-swept hyperbolic secant (HS) pulse with comb modulation. We also study the spin dynamics under the comb-modulated HS pulse by numerical simulations, and experimentally demonstrate the feasibility of the proposed scheme, which is referred to as RApid-Scan with GApped excitation with Dual-mode Operation (RASGADOL) NQR. For the latter, we examined 35Cl-39K SEDOR-NQR with using CPMG and 35Cl-39K nutation-NQR experiments. It was shown that the size as well as orientation of the 35Cl-39K dipolar interaction relative to rf-excitation and quadrupolar tensors affect the observed intensities of the 35Cl CPMG echo-train signal.
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| Free Research Field |
物理化学
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| Academic Significance and Societal Importance of the Research Achievements |
四極子相互作用が大きくNMRでは解析困難であった粉末試料の四極子核スピンのNQRは、高度化することで非晶質固体の構造研究の強力なツールになりうるが、NQRを用いた研究はNMRに比べて行われていない。その理由の１つに、まずNQR信号を見つけることの困難さがあった。また、NQRの高度化に必要なハードウエア・測定法・解析理論が未だ整備されていないことも理由であった。本研究で実現した迅速なNQR信号探索法や二共鳴NQRにより、上記のNQRが不人気な理由はある程度克服され、NQRを粉末試料の分光法として進歩させた意義は大きい。
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