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首页> 外文期刊>Journal of magnetic resonance >Measurement of dipolar structure of O-17 nuclear quadrupole resonance lines by three-frequency irradiation
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Measurement of dipolar structure of O-17 nuclear quadrupole resonance lines by three-frequency irradiation

机译：三频辐射测量O-17核四极共振线的偶极结构

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摘要

A modification of nuclear quadrupole double resonance with coupled multiplet is proposed which can be used for the measurement of the dipolar structure of the O-17 nuclear quadrupole resonance lines in case of a strong H-1-O-17 dipolar interaction. The technique is based on magnetic field cycling between a high magnetic field and zero magnetic field and on the simultaneous application of three rf magnetic fields with the frequencies that are close to the three O-17 NQR frequencies nu(5/2-1/2) > nu(5/2-3/2) >= nu(3/2-1/2) during the time spent in zero static magnetic field. When the sum of the two lower irradiation frequencies nu(1) + nu(2) is not equal to the highest irradiation frequency nu, the three-frequency irradiation increases the proton relaxation rate in zero magnetic field and consequently decreases the proton NMR signal at the end of the magnetic field cycle. The new technique is theoretically analyzed and compared to the single-frequency and two-frequency irradiation techniques. It is shown that the sensitivity of the new technique exceeds the sensitivity of the two-frequency irradiation technique. As a test of the new technique we measured the shape of the highest-frequency O-17 NQR line in paraelectric KH2PO4.
机译：提出了具有耦合多重态的核四极子双共振的改进方案，可用于在强H-1-O-17偶极相互作用的情况下测量O-17核四极共振线的偶极结构。该技术基于高磁场和零磁场之间的磁场循环，以及同时施加频率接近三个O-17 NQR频率nu（5 / 2-1 / 2）的三个rf磁场）> nu（5 / 2-3 / 2）> = nu（3 / 2-1 / 2）在零静态磁场中花费的时间。当两个较低的辐照频率nu（1）+ nu（2）的总和不等于最高辐照频率nu时，三频辐照会增加零磁场中的质子弛豫率，从而降低质子NMR信号磁场循环的结束。从理论上分析了该新技术，并将其与单频和双频辐照技术进行了比较。结果表明，新技术的灵敏度超过了双频辐照技术的灵敏度。作为对新技术的测试，我们测量了顺电KH2PO4中最高频率的O-17 NQR线的形状。

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