Photophysics

Part of speech: noun

Definitions

1. The study of physical processes and phenomena related to the interaction of light with matter, including absorption, emission, and energy transfer
2. A scientific discipline focusing on the behavior and effects of light when it engages with different substances, encompassing fluorescence, phosphorescence, and other light-induced events
3. An area of physical science dedicated to understanding how electromagnetic radiation in the visible spectrum influences molecular and atomic systems through various photophysical mechanisms

Etymology: Photophysics is a compound built from two Greek roots. The first, "phōs" (genitive "phōtos"), meant "light," and its combining form "photo-" gave English a whole family of words for things involving light. The second is physics, which descends from the Greek "phusikos," "concerning nature," through Latin "physicus" and Middle English "phisik." Put together, the name describes the study of nature as it concerns light, that is, what happens when light meets matter. The word is a transparent formation rather than a coinage with a famous backstory: the parts were already in use and simply joined. Its meaning follows its parts closely. The field studies the physical processes by which light is absorbed, emitted, and transformed by atoms and molecules, which is why it sits between optics, chemistry, and quantum physics.