Spectroscopy
Vibrational spectroscopy is

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

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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
the Fourier Transfer Algorithm allows us to scan all frequencies at once
None of these
absence of broad spectrum of wavelenth

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