Cryogen-free 400 MHz (9.4 T) solid state MAS NMR system with liquid state NMR potential

We show that the temporal magnetic field distortion generated by the Cold Head operation can be removed and high quality Solid-State Magic Angle Spinning NMR results can be obtained with a cryogen-free magnet. The compact design of the cryogen-free magnets allows for the probe to be inserted either from the bottom (as in most NMR systems) or, more conveniently, from the top. The magnetic field settling time can be made as short as an hour after a field ramp. Therefore, a single cryogen-free magnet can be used at different fixed fields. The magnetic field can be changed every day without compromising the measurement resolution.

Automated summary

We demonstrate that the temporal magnetic field distortion caused by Cold Head operation can be eliminated, enabling high-quality Solid-State Magic Angle Spinning NMR results with a cryogen-free magnet. The compact design of the cryogen-free magnets allows for easy insertion of the probe from either the bottom or the top. The settling time for the magnetic field can be reduced to as short as an hour after a field ramp, allowing for different fixed fields to be used with a single cryogen-free magnet and daily changes in the magnetic field without compromising measurement resolution.