Explore the mechanisms of line broadening in plasma diagnostics through this comprehensive lecture from MIT's Principles of Plasma Diagnostics course. Delve into natural, Doppler, Stark, and Zeeman broadening effects, gaining a deeper understanding of how these phenomena impact spectral line shapes in plasma. Learn from instructor Jack Hare as he explains the fundamental principles and applications of these broadening mechanisms in plasma physics and diagnostics. Access this valuable educational resource as part of MIT OpenCourseWare's Fall 2023 offerings, available for free under a Creative Commons license.