Considering the energy conservation law, we deduce a general formula to calculate the dielectric constant (ε r) of alkali halide crystals(including the crystal structure of NaCl and CsCl) using the theory that the macroscopic electric storage energy is equal to the elastic displacement energy of .

Study for Luminescence Energies of Self-Trapped Exaction(STE) and Absorption Energies of V_k-Center in Ammonium Halide Crystals;