Calculations using density functional theoretical( B3PW91) method with 6-311 G( 3df,3 pd) basis sets were performed on the total energies,equilibrium structures,dipole moments,atomic charge distributions,infrared intensities,harmonic frequencies,highest occupied molecular orbital( HOMO) energy levels,lowest unoccupied molecular orbital( LUMO) energy levels,and energy gaps of the ground state Ga N molecules under different intense electric fields. The results show that the harmonic frequency( f = 576. 2218 c...