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Quantum mechanics thinks that all atoms do not have permanent electric dipolemoment (EDM) because of their spherical symmetry. Therefore, there is no polaratom in nature except for polar molecules. The electric susceptibility Xecaused by the orientation of polar substances is inversely proportional to theabsolute temperature T while the induced susceptibility of atoms is temperatureindependent. Using special capacitors our experiments discovered thatdirectional motion of Rb atoms in a non-uniform electric field and ground stateRb atom is polar atom with a large EDM: d(Rb) =2.72*10-29C.m = 1.70*10-8e.cm.The experiment showed that the relationship between Xe of Rb vapor and T isjust Xe =B/T, where the slope B =380(k) as polar molecules. Its capacitance Cat different voltage V was measured. The C-V curve shows that the saturationpolarization of Rb vapor has be observed when E more than 8.5*104V/m. Newexample of CP (charge conjugation and parity) violation occurred in Rb atoms(see arXiv 0809.4767). If Rb atom has a large EDM, why the linear Stark effecthas not been observed? The article discussed the question thoroughly. Ourresults are easy to be repeated because the details of the experiment aredescribed in the article.

New example of charge conjugation and parity violation from search for a permanent electric dipole moment of Rubidium atom