FT IR Spectroscopy
What is the name given to the relaxation process due to an interaction between an excited nucleus and the magnetic fields caused by nuclei in molecules moving around in the sample?

Spin - spin relaxation
None of these
Spin - lattice relaxation
Spin - spin - spin relaxation

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FT IR Spectroscopy
What does the Michelson interferometer do?

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

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

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