45:25 1. Quantum Mechanics—Historical Background, Photoelectric Effect, Compton Scattering MIT OpenCourseWare
52:29 30. Time-Dependent Perturbation Theory I: H is Time-Independent, Zewail Wavepacket. MIT OpenCourseWare
52:45 31. Time-Dependent Perturbation Theory II: H is Time-Dependent: Two-Level Problem MIT OpenCourseWare
48:41 36. Time Dependence of Two-Level Systems: Density Matrix, Rotating Wave Approximation MIT OpenCourseWare