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Nuclear magnetic resonance involves transitions of

  • A.electron spin in an applied electric field
  • B.bonding electrons between molecular orbitals
  • C.the whole molecule between rotational states
  • D.nuclear spin in an applied magnetic field

Answer: D

The field splits the spin states of a nucleus such as the proton, and radio frequency photons of very small energy flip between them. The splitting is proportional to the field, which is why higher-field instruments give better resolution.

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