Ultraviolet-visible (UV-Vis) spectroscopy analyzes electronic transitions in molecules to quantify and identify compounds based on absorption of light from 200 to 700 nanometers.

In UV-Vis spectroscopy, molecules absorb photons that promote electrons from ground to excited states, mainly involving conjugated systems and aromatic compounds. Measuring absorbance at specific wavelengths allows quantification of concentration and provides clues about electronic structure. It’s widely used in chemical analysis due to its speed, simplicity, and ability to track reaction progress and purity.