Study the physical properties for Nitrogen molecules by using software molecular modeling by using(PM3) semiemperical method of quantum mechanic

Abstract

This research study nitrogen molecules(N₂) which is consider as linear molecule with diatoms atoms, The aim of this research was studying the effect of the bond(NºN) on the thermal and spectral properties of N₂   molecules by using one of semiemperical methods of quantum mechanic (PM3)and comparison with  the experimental results.We calculate and study the importanl physical properties for N₂ molecules like geometrical shape at equailibrium point,calculation the stretch length of the bond ((NºN) and from potiential dissiontion enrgy curve of N₂ molecules we calculate the spectral decay enrgy and the frequency of vibration mode of the  N₂ molecules Also,we studied the thermal  properties(thermodynamic) for the  molecules with range from (100-500)K these properties are the heat of formation, heat capacity,entropy and enthalpy.The relations between these properties with temperature were ploted and discussed with expermintal results.