FT IR Spectroscopy
What does the Michelson interferometer do?

Split a polychromatic beam of radiation into its component wavelengths
Modulate the I.R. signal at a lower frequency, so that it can be observed by a detector
None of these
Selectively filter certain wavelengths from a beam of I.R. radiation

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

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

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