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Ultraviolet and visible spectrum (UV-Vis) is a method to study the relative intensity of light absorption of material molecules by irradiating samples with continuous spectrum of electromagnetic waves in the UV-visible region as a light source. The molecule or group in the substance absorbs the incident UV-visible energy, and the energy transition between electrons produces a characteristic UV-visible spectrum, which can be used to determine the structure of the compound and characterize the properties of the compound. Ultraviolet-visible absorption spectroscopy is widely used in chemistry, materials, biology, medicine, food, environment and other fields.