Spectroscopy
Why are rotational transitions of little use to a spectroscopist?

Because the energy required to induce a rotational transition is so small that it cannot be measured
Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
All of these
Because rotational transitions are extremely rare

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Spectroscopy
Vibrational spectroscopy is

an Infrared spectroscopy
a flashlight through a prism and shake it
a class of spectroscopic techniques which analyzes molecular motions
a large mass on a weak spring

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Spectroscopy
In the past, IR spectra had to be aquired one wavelength at a time, which took a long time. Today quick spectra is due to the

light is faster today that it used to be
absence of broad spectrum of wavelenth
the Fourier Transfer Algorithm allows us to scan all frequencies at once
None of these

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