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"Chemical shift"


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I read some explanations and definitions, still do not have it clear. Any simpler wording from any of you, please? (Nuclear magnetic resonance spectroscopy)





From what I grabbed; when exposing an element to a magnetic field, its resonant frequency changes (shifts) certain frequency. As for Au, it is 1.712690 MHz. For Ag is 4.653623 MHz, ...



-That amount of shift corresponds to a fixed reference amount of field, say 7 Tesla. ?

-Is the shift less for a lower intensity magnetic field ?

-What are the Ag, Au resonant frequencies without the shift because of the field, or at its 'rest' condition ? Higher or lower Hz amount ?

-Is there a 'decay time' of the shift after removing the magnetic field or is it instantaneous ?



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