# [CP2K-user] [CP2K:19271] How do Atoms Move in an Electric Potential

Dev Rana dev.rana3 at gmail.com
Fri Sep 22 01:45:50 UTC 2023

```Hi All,

I had a theoretical question regarding the electric potential that is
applied in CP2K.

Let's say that a simulation box has a electric potential gradient applied
to it in the +x-direction: electric potential gradient = 2X

If you have positively charged ions (cations) and negatively charged ions
(anions), which direction would they flow in relation to the electric

Do cations flow in the direction of the gradient (+x-direction) or against

The way that CP2K applies the gradient is 2x, meaning that further away
(x=10), the potential is 20 and nearer (x=1) the potential is 2. Wouldn't
this imply then that cations flow to the more negative direction (-x
direction) and anions flow to the higher potential (+x-direction)?

Just trying to wrap my head around this. Thanks!

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