Patent ID: 6897657

Claim:
A nuclear magnetic resonance spectrometer for liquid-solution which comprises a superconductive magnet including paired split magnets for generating a magnetic field in a horizontal direction, a low temperature container for cooling said superconductive magnet, said low temperature container having a first space perpendicular to a horizontal magnetic field generated by said superconductive magnet and a second space along said horizontal magnetic field generated by said superconductive magnet, a high-frequency transmission coil and a reception coil and in which a sample such as protein dissolved in a liquid-solution is charged in a sample tube of a diameter of 5 to 10 mm, wherein a stationary magnetic field generated by said superconductive magnet is 11 T or more, the direction of the stationary magnetic field generated by said superconductive magnet is in the horizontal direction, a change of proton nuclear magnetic resonance frequency due to a change of said stationary magnetic field is 1.0 Hz/hour or less, the uniformity of said stationary magnetic field in a sample space is 1.0 Hz or less in terms of proton nuclear magnetic resonance frequency, said liquid-solution sample is inserted in the magnetic field center from above said first space, and said reception coil is a solenoid coil inserted in the magnetic field center from below the spectrometer.