What is the difference between "excitement" and "excitation"?

I know that the first one is usually used for describing emotional state and the second one in science e.g. in physics.

But why are these words different and what is the logic behind each of these forms?

Solution 1:

In general, it seems the suffix -ment describes a state, a result if you want, whereas -ation seems to indicate an action.

From the source that @Keep these mind mentioned, we see indeed for excitement:

the state of being excited

and for excitation:

The act of exciting [...]
The act of producing excitement [...]
(physiology) The activity produced in an organ [...]
(physics) The change in state [...]

Indicating action rather than a state.