Introduction to spectroscopy
Spectroscopy is an important interdisciplinary subject that mainly involves physics and chemistry. It uses spectroscopy to study the interaction between electromagnetic waves and matter. Light is an electromagnetic radiation superimposed by electromagnetic waves of various wavelengths (or frequencies). The spectrum is a type of graph that uses a grating, prism, Fourier transform and other spectroscopic means to analyze a certain property of a beam of electromagnetic radiation into the contribution of each component wavelength of this radiation to this property. For example, an absorption spectrum can list the absorption degree of a substance for a corresponding wavelength in a certain wavelength band from low to high wavelength order.