4.7.2 Microscopic Examination of Polarizability
From the equation (4.83), for electronic polarization, we can write the electronic or atomic polarizability as
 |
(4.89) |
Here, we have replaced the subscript i with e for electrons.
We can get an expression for ω0 ( = (k (spring constant)/m (mass))1/2) by equating the restoring force (k.dx) and the force inducing the displacement. From that the atomic polarizability can be expressed as
 |
(4.90) |
which is nothing but equation (4.34) where we worked out the atomic polarizability just from force balance.
A similar analysis can be carried out for ionic polarization as well which is left to you as an exercise. |
