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

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
None of these
That the detector rotates around the sample

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FT IR Spectroscopy
In scanning electron microscopy

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

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