Photolysis
Photolysis
Photolysis (/foʊˈtɒlɪsɪs/; from the Greek φῶς, phōs, "light" and λύσις, lúsis, "loosening") is a process by which molecules are broken down into smaller units through the absorption of light.
Etymology
The term "photolysis" is derived from the Greek words phōs meaning "light" and lúsis meaning "loosening" or "dissolution". It was first used in the early 20th century to describe the process of using light to break down molecules.
Process
Photolysis occurs when a molecule absorbs light and breaks down into smaller units. This can happen in the atmosphere, in water, or in other environments where light is present. The energy from the light is absorbed by the molecule, which causes it to break apart. The resulting fragments can then react with other molecules, leading to a chain reaction of chemical reactions.
Types of Photolysis
There are several types of photolysis, including direct photolysis and indirect photolysis. Direct photolysis occurs when a molecule absorbs light directly and breaks down as a result. Indirect photolysis, on the other hand, involves the absorption of light by a different molecule, which then transfers energy to the target molecule, causing it to break down.
Applications
Photolysis has a wide range of applications, from the natural processes that occur in the atmosphere and oceans, to industrial processes such as water treatment and waste management. It is also used in scientific research, particularly in the fields of chemistry and biology, to study the properties of molecules and their reactions to light.
Related Terms
- Photodegradation: The alteration of materials by light.
- Photodissociation: The process by which a chemical compound is broken down by photons.
- Photochemistry: The branch of chemistry concerned with the chemical effects of light.
External links
- Medical encyclopedia article on Photolysis
- Wikipedia's article - Photolysis
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