This absorption happens when two atoms collide with each other while one of them has an excited electron.

I have never liked it much because it is the excited electrons that are actually doing the work as they move through the conductor.

It's like an excited electron, left to itself it drops back to its ground state.

The excited electrons would fall back to their original levels and emit energy as light.

The excited electrons release their energy as photons - light.

People tried to look smooth, but they bounced around like excited electrons.

When these excited electrons fall back to their original energy levels, they emit energy as light.

In essence, the spin of the excited electron is reversed.

The energy necessary for an excited electron to jump from one orbital level to another.

These trapped holes allow photo excited electrons to be available for chemisorption.