Towards a beyond 1 GHz solid-state nuclear magnetic resonance: external lock operation in an external current mode for a 500 MHz nuclear magnetic resonance.

Achieving a higher magnetic field is important for solid-state nuclear magnetic resonance (NMR). But a conventional low temperature superconducting (LTS) magnet cannot exceed 1 GHz (23.5 T) due to the critical magnetic field.

Application of ultra-high magnetic field for saccharide molecules: 1H NMR spectra of 6-O-alpha-D-glucopyranosyl-cyclomaltoheptaose and -cyclomaltohexaose.

1H NMR spectra of G1-alpha-CD and G1-beta-CD were recorded using a spectrometer equipped with a 21.6 T magnet. An ultra-high magnetic field was effective for detecting 1H NMR signals with a small difference in chemical shifts.