decoupling

1. The act or process by which something is decoupled.countableuncountable

2. (cosmology) The emission of photons during Recombination.Examples: "Directly combining in a low energy state (ground state) is less efficient, so these hydrogen atoms generally form with the electrons still in a high-energy state, and once combined, the electrons quickly release energy in the form of one or more photons as they transition to a low energy state. This release of photons is known as photon decoupling."countableuncountable