Animations of atoms or molecules for short film

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I'm working on a "short film" of sorts and I'm looking for computer-generated animations of atoms. I'm not talking about cheezy little gifs, I'm looking for something that's good quality. Anyone know where I can find some? Also, anyone know the legality of using short clips (~10 seconds) of other peoples work in a free film? I'm guessing it's not legal without permission...but I see them all over the internet.

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Stop being lazy and do my searches! Immediately!

[Klaynos]

Rofl

 

The legality issue, it depends on the copyright attached to the clips from where you get them

 

I've never come across anything other than silly little gifs, :s looking for vids if brownian motion experiments might be a good direction, but I'm lazy