Outline
Lecture notes
1. Introduction
2. Radiative transfer
3. Spectral lines
4. Atomic spectroscopy
5. Molecular spectroscopy
6. Neutral interstellar gas
7. Collisional excitation
8. Ionization and recombination
9. Free-free radiation
10. Synchrotron radiation
11. Interstellar dust
12. Radiation fields
Addition of angular momenta
Radiative transitions
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