1. What is spectroscopy? -- 2. The electromagnetic spectrum -- 3. Quantization and the hydrogen atom -- 4. Quantization in polyelectronic atoms -- 5. Electronic states of diatomic and polyatomic molecules -- 6. Molecular vibrations -- 7. Molecular rotation -- 8. How spectra are obtained -- 9. Rotational spectroscopy -- 10. Vibrational spectroscopy -- 11. Electronic spectroscopy