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Why fluctuations?

Posted: Sun May 20, 2018 11:32 am
by Mei Blundell_1J
In induced dipole-induced dipole interactions, fluctuations in electron probability cloud density in one molecule causes complementary fluctuations in a nearby molecule. Why are there fluctuations in the electron cloud to begin with, and why doesn't the system equilibrate until both molecules are stable with each other and there are no fluctuations?

Thanks

Re: Why fluctuations?  [ENDORSED]

Posted: Sun May 20, 2018 11:44 am
by Chem_Mod
Because atoms and molecules are free to move around, resulting in electron density fluctuations.

Re: Why fluctuations?

Posted: Sun May 20, 2018 11:49 am
by Mei Blundell_1J
Oh that makes sense. When molecules move around they change where attractions and repulsions are located. This changes the orientation of dipoles and causes constant fluctuation. I think I get it, thanks!