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

None of these
That the sample is spun rapidly in the applied field
That the detector rotates around the sample
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 ensure that all target nuclei in the sample have been excited
None of these
To remove inaccuracies caused by fluctuations in the applied magnetic field
To increase sensitivity

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