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...Fluorimetry emission flame photomete r spectrosco py nmr absorption ir uv electromagnetic spectrum frequency n in hz wavelength l nm cm m energy kcal mol g rays x microwave radio nuclear core electronic molecular magnetic excitation electron vibration rotation resonance pet p to mri ray cryst visible contents introduction theory instrumentation infrared group analysis spectroscopy is an useful tool identify functional groups organic molecules important record which gives sufficient information about the structure of a compound and also determine study interaction matter with radiation displays properties both particles waves particle component called photon e proportional where h planck s constant hertz cycles per second hn c hc speed light...