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?

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

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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?

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
To increase sensitivity

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