The orientation polarization requires much more time when compared with the electronic and atomic polarization
to reach the "static field value." Therefore, at lower frequency regions, the orientation polarization decreases with increase in frequency when compared with the electronic and atomic polarizations
where [P.sub.Rb] is the rubidium atomic polarization
, [gamma] a [.sup.3]He or xenon polarization relaxation rate, [[gamma].sub.SE] a spin exchange rate between rubidium atoms and noble gas nuclei .
Allowing for a minor additional term ([is approximately equal to] [[Epsilon][prime].sub.e]/10) for atomic polarization
, the combined contribution of electronic and atomic components to permittivity is therefore [is less than or equal to] 3.0 units in epoxy resin, which has [Mu] = 1.57 in the liquid state, and 1.59 after curing.