FT IR Spectroscopy
In scanning electron microscopy

a specimen is fixed and then coated with transition metal
a specimen is fixed and then coated with thin layer of a heavy metal
a specimen is not fixed and then coated with thin layer of a heavy metal
None of these

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

That the detector rotates around the sample
That the sample is spun rapidly in the applied field
If the laboratory itself is imagined to be rotated at the Larmor frequency, viewing that individual magnetic moment vectors are fixed in space
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
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

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