Patent ID: 8436616

Claim:
A solid-state NMR sample tube capable of sealing a sample, to be investigated by solid-state NMR spectroscopy, the sample tube being capable of being spun at high speed, where high speed is from a few kHz to tens of kHz, via gas bearings which are formed between the sample tube and a tube-holding mechanism that holds the tube by being supplied with a gas, said sample tube comprising: a hollow cylinder having opposite ends, at least one of the ends being open in order to form an opening; and a cover mounted in the opening, wherein the sample tube has a length L, an outside diameter D, and an inside diameter d which satisfy the following relationship: ( L / D ) < λ ⁡ ( 1 8 ⁢ c ) 1 / 2 · ( ( 1 + ( d D ) 2 ) · E ρ ) 1 / 4 · B 1 / 2 ( 1 ) where E is the longitudinal elastic modulus, ρ is the density, λ is 4.730, c is the sonic velocity (340 m/s), and B is a factor which is dependent on (L/D) and which is a value interpolated or extrapolated from each point in the following table: (L/D) 3 4 5 6 7 8 10 20 Bo 0.77 0.84 0.89 0.91 0.93 0.95 0.97 0.99.