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

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

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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
To remove inaccuracies caused by fluctuations in the applied magnetic field
None of these
To increase sensitivity

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

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

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