Experimental Arrangement in Absorption Spectroscopy
In an absorption spectroscopy experiment, this absorption is determined as a function of wavelength, frequency or energy in an instrument called spectrophotometer or spectrometer (fig.1.1).
A detector measures the intensity of radiation that passed through the sample unabsorbed; when the intensity of the source through the amount of radiation absorbed by the sample is known.
There are many types of spectroscopy. The three types of greatest use to the organic chemist for structure determination are NMR, IR and UV, and spectroscopy.
These type of spectroscopy differ conceptually only in the type of radiation used, although the kind of spectrometer required for each is quite different. Mass spectroscopy is the fourth physical technique but it is not a type of absorption spectroscopy and thus fundamentally different from NMR, IR and UV spectroscopy.
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