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

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FT IR Spectroscopy
What is meant by rotating frame of reference?

That the detector rotates around the sample
None of these
That the sample is spun rapidly in the applied field
If the laboratory itself is imagined to be rotated at the Larmor frequency, viewing that individual magnetic moment vectors are fixed in space

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FT IR Spectroscopy
Why is it advantageous to record many FID signals from the same sample and then add them together?

To remove inaccuracies caused by fluctuations in the applied magnetic field
To ensure that all target nuclei in the sample have been excited
None of these
To increase sensitivity

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