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The linear Stark effect shows that the first excited state of hydrogen atomhas large permanent electric dipole moment (EDM), d(H)=3eao (ao is Bohrradius). Using special capacitors our experiments discovered that the groundstate K, Rb or Cs atom is polar atom with a large EDM of the order of eao ashydrogen atom of excited state. Their capacitance(C) at different voltage (V)was measured. The C-V curve shows that the saturation polarization of K, Rb orCs vapor has be observed when the field E more than ten to the fifth power V/m.When the saturation polarization appeared, nearly all K, Rb or Cs atoms(morethan 98 percent) turned toward the direction of the field, and C isapproximately equal to Co (Co is vacuum capacitance) or their dielectricconstant is nearly the same as vacuum! K, Rb or Cs vapor just exist in thelowest energy state, so we see the vacuum state containing a large number ofatoms! Due to the saturation polarization of hydrogen vapor of excited state iseasily appears, we conjecture that a vacuum state containing a large number ofhydrogen atom of excited state may exist at early Universe when the absolutetemperature T is approximately equal to ten to the fifth power K.

A probable vacuum state containing a large number of hydrogen atom of excited state or ground state K, Rb or Cs atom