Infrared spectroscopy.
O-H 3580 3670 Free –OH in alcohols
(only in samples di-
luted with non-polar
solvent)Absorptions listed in cm-1.
Figure 193 frame
103.2 Typical method.
2
Figure 194 Typical apparatus
A beam of infra-red light is produced and split into two separate beams. One is passed
through the sample, the other passed through a reference which is often the substance the
sample is dissolved in. The beams are both reflected back towards a detector, however first
they pass through a splitter which quickly alternates which of the two beams enters the
detector. The two signals are then compared and a printout is obtained.
2 Wikipedia article. ˆ{https://en.wikipedia.org/wiki/Infrared_spectroscopy}