In this lecture, the professor reviewed Landau-Zener problem; discussed density matrix formalism for arbitrary two-level systems; and started the new chapter "Atoms".

1. Resonance I
2. Resonance II
3. Resonance III
4. Resonance IV
5. Resonance V and Atoms I
6. Atoms II
7. Atoms III
8. Atoms IV
9. Atoms V and Atoms in External Fields I
10. Atoms in External Fields II
11. Atoms in External Fields III
12. Atoms in External Fields IV and Atom-light Interactions I
13. Atom-light Interactions II
14. Atom-light Interactions III
15. Atom-light Interactions IV
16. Atom-light Interactions V
17. Atom-light Interactions VI and Line Broadening I
18. Line Broadening II
19. Line Broadening III
20. Line Broadening IV and Two-photon Excitation I
21. Two-photon Excitation II and Coherence I
22. Coherence II
23. Coherence III
24. Coherence IV
25. Coherence V

This is the first of a two-semester subject sequence that provides the foundations for contemporary research in selected areas of atomic and optical physics. Topics covered include the interaction of radiation with atoms: resonance; absorption, stimulated and spontaneous emission; methods of resonance, dressed atom formalism, masers and lasers, cavity quantum electrodynamics; structure of simple atoms, behavior in very strong fields; fundamental tests: time reversal, parity violations, Bell's inequalities; and experimental methods.

MAIN TOPICS:
- The two-state systems: Resonance
- Atoms—electronic structure
- Helium atom
- Fine structure and Lamb shift
- Hyperfine structure; Magnetic fields
- Atoms in electric fields
- Interaction of an Atom with an Electro-Magnetic Field
- Einstein's A and B coefficient
- Saturation of transitions
- Line shapes
- Two-photon transitions
- Coherence
- Dicke superradiance