Explore atomic models for spectra and different equilibria in this 1-hour 14-minute lecture on line radiation from MIT's Principles of Plasma Diagnostics course. Delve into the fundamental concepts of plasma spectroscopy as instructor Jack Hare guides you through the intricacies of atomic emission and absorption processes. Gain insights into how various equilibrium conditions affect spectral line formation and interpretation in plasma diagnostics. Enhance your understanding of plasma physics and spectroscopic analysis techniques essential for advanced research and applications in fusion energy, astrophysics, and materials science.