Knight Shift


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Knight shift

[′nīt ‚shift]
(physics)
A shift of the nuclear magnetic resonance frequency in a metal to higher values than that of the same nucleus in a diamagnetic compound.

Knight Shift

 

a shift in the resonance frequencies of nuclear magnetic resonance in metals and alloys owing to relaxation caused by the interaction between the conduction electrons and the magnetic moments of the atomic nuclei. It was discovered and explained by the American physicist W. D. Knight in 1949.

References in periodicals archive ?
There are two known contributions to the total [sup.13]C NMR shift of metallic tubes, namely, the Knight shift K and the chemical shift [sigma], where the Knight shift arises from the hyperfine coupling of the nuclei to conduction electron spins and the chemical shift summarizes all contributions from orbital currents due to local magnetic fields.
KNIGHT SHIFT: Percy Main's Steve Knight at the crease during his side's NTSL victory over Ryton
LEWIS HAMILTON will climb into the cockpit for Sunday worship at Silverstone with the foreman of Formula One's knight shift among the latest converts to his "genius".
PEAK TIME: The shot which inspired Gary; SET IN STONE: Shona's ring; KNIGHT SHIFT: Shona's photo (left) had Gary rushing out to buy the ring, organise the wedding and US honeymoon - and to settle down in Norfolk
Set in a living, fully-3D game environment, Knight Shift bewitches the player's PC with breathtaking graphics and effects.
KNIGHT SHIFT: Sir Kenneth Branagh directs the new Disney live-action film of Cinderella
TURN OVER FOR SCOTLAND'S BEST TV GUIDE KNIGHT SHIFT..