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Achievement of 1020MHz NMR.

Authors :: Hashi K
Ohki S
Matsumoto S
Nishijima G
Goto A
Deguchi K
Yamada K
Noguchi T
Sakai S
Takahashi M
Yanagisawa Y
Iguchi S
Yamazaki T
Maeda H
Tanaka R
Nemoto T
Suematsu H
Miki T
Saito K
Shimizu T
Source :: Journal of magnetic resonance (San Diego, Calif. : 1997) [J Magn Reson] 2015 Jul; Vol. 256, pp. 30-33. Date of Electronic Publication: 2015 May 07.
Publication Year :: 2015
Abstract: We have successfully developed a 1020MHz (24.0T) NMR magnet, establishing the world's highest magnetic field in high resolution NMR superconducting magnets. The magnet is a series connection of LTS (low-Tc superconductors NbTi and Nb3Sn) outer coils and an HTS (high-Tc superconductor, Bi-2223) innermost coil, being operated at superfluid liquid helium temperature such as around 1.8K and in a driven-mode by an external DC power supply. The drift of the magnetic field was initially ±0.8ppm/10h without the (2)H lock operation; it was then stabilized to be less than 1ppb/10h by using an NMR internal lock operation. The full-width at half maximum of a (1)H spectrum taken for 1% CHCl3 in acetone-d6 was as low as 0.7Hz (0.7ppb), which was sufficient for solution NMR. On the contrary, the temporal field stability under the external lock operation for solid-state NMR was 170ppb/10h, sufficient for NMR measurements for quadrupolar nuclei such as (17)O; a (17)O NMR measurement for labeled tri-peptide clearly demonstrated the effect of high magnetic field on solid-state NMR spectra.<br /> (Copyright © 2015 Elsevier Inc. All rights reserved.)