超1 GHz NMR システムの開発

―マグネットの評価とNMR 測定への応用―

抄録

The stability and homogeneity of a 1,020 MHz NMR magnet were evaluated by NMR measurements. The drift of the magnetic field was initially ±0.8 ppm/10 h without using the NMR lock operation, and was then stabilized to less than 1 ppb/10 h using the NMR lock operation. The full width at half-maximum of the ¹H spectrum taken for 1% CHCl₃ in acetone-d₆ was as low as 0.7 Hz (0.7 ppb). These results indicate that the specifications of the 1,020 MHz NMR magnet satisfy the requirements for NMR measurements. In order to demonstrate the efficiency of a high magnetic field, some solid-state NMR spectra were measured at 24.0 T.