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Infrared (IR) spectroscopy

This method deals with the IR region of the electromagnetic spectrum, that is light with a longer wavelength and lower frequency than visible light. It is often used to identify and study the molecular structure of organic compounds.

Ultraviolet (UV) spectroscopy

UV spectroscopy refers to absorption spectroscopy or reflectance spectroscopy in the ultraviolet-visible spectral region. The absorption or reflectance in the visible range directly affects the perceived color of the chemicals involved. In this region of the electromagnetic spectrum, molecules undergo electronic transitions

Polarimetry

Measurement of the angle of rotation of the plane of polarized lite (that is, a beam of light in which the vibrations of the electromagnetic waves are confined to one plane) is of interest to the chemist because the ability of substance to affect polarized light is closely related to its chemical structure.