The most important intermolecular forces that exist between atoms of nitrogen gas (N2) are London Dispersion Forces.
London Dispersion Forces are the weakest intermolecular forces and exist between all atoms and molecules, regardless of their polarity. These forces arise from temporary fluctuations in the electron density around an atom or molecule, which can create temporary dipoles that induce similar dipoles in neighboring atoms or molecules.
In the case of nitrogen gas, the N2 molecules are nonpolar and do not have a permanent dipole moment. Therefore, the only intermolecular forces that exist between N2 molecules are London Dispersion Forces.