<Dd> p = ∑ i = 1 N q i (r i − r c). (\ displaystyle (\ mathfrak (p)) = \ sum _ (i = 1) ^ (N) \, q_ (i) \, (\ mathbf (r) _ (i) - \ mathbf (r) _ (c)) \, .) </Dd> <P> where r c (\ displaystyle \ mathbf (r) _ (c)) is the center of mass of the molecule / group of particles . </P> <P> A non-degenerate (S - state) atom can have only a zero permanent dipole . This fact follows quantum mechanically from the inversion symmetry of atoms . All 3 components of the dipole operator are antisymmetric under inversion with respect to the nucleus, </P> <Dl> <Dd> I p I − 1 = − p, (\ displaystyle (\ mathfrak (I)) \; (\ mathfrak (p)) \; (\ mathfrak (I)) ^ (- 1) = - (\ mathfrak (p)),) </Dd> </Dl>

What is the nature of symmetry of a dipole potential
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