Dependence of the polarization on an alternative electric field frequency

5 Dependence of the polarization on an alternative electric field frequency 

Atomic polarization does not need the molecnles reorientation in a high frequency field, the induced oscillations of atoms along the field direction take place. This will be preserved up to a frequency of approximately 10 Hz. At this value, atomic oscillations also vanish and only electron oscillations (the lightest part of atoms) remain. 

At V 10 -10 Hz, only electrons can accomplish their oscillations. This frequency corresponds to oscillations of fight vectors, magnetic and, mainly, electric. At such frequencies, only the electron part remains at higher frequencies, even the electron part disappears. 

The frequency dependence explains why the dielectric permeability of water measured in a static electric field is 81, but at optic frequencies is only 1.77 in the first case all polarization mechanisms are participating in the polarization but in the latter case only electron polarization takes place. 

---