FT IR Spectroscopy
When radiation energy is absorbed by a spin 1/2 nucleus in a magnetic field, what happens?

The processional frequency of the nucleus increases
None of these
The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field
The nucleus spins faster

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FT IR Spectroscopy
In FT-NMR, how are nuclei excited?

None of these
By an intense pressure
By radio-frequency radiation whose frequency is swept across a predetermined range
By an intense pulse of radiation which contains a wide range of frequencies

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