Then the electrons drop back, releasing photons.

One of the simplest of these effects is electrons releasing photons.

Atoms release light photons when their electrons become excited.

A laser is a device that controls the way that energized atoms release photons.

After that, they will jump down to a lower energy state by releasing photons containing energy.

As they do, they release photons of light.

This process releases photons of light.

Metal atoms release mostly infrared light photons, which are invisible to the human eye.

When the electrons return to their original energy level, they release light photons.

As they recombine with their lost electrons they immediately drop back to a lower energy state, releasing photons in the process.