Nahar has published extensively on radiative and collisional atomic processes in astrophysical and laboratory plasmas, including Photoionization, electron-ion recombination, photo-excitations and de-excitations, and electron-ion scattering. She has also worked on dielectronic satellite lines, theoretical spectroscopy, and computational nanospectroscopy for biomedical applications. She is a member of the international collaborations, "Opacity Project" and "Iron Project," to study radiative and collisional atomic processes and calculate accurate atomic parameters for astrophysically abundant atoms and ions.