1. Photons of Light The smallest unit of light is a photon A photon is often called a particle of light The Energy of an individual photon depends on its wavelength (frequency) The Energy of a photon is proportional to its frequency: E = h f = hc /

2. Electromagnetic Spectrum

3. Energy Levels and Spectral Lines

4. Absorption vs. Emission

5. Unique Spectral Lines for Atoms

6. More Emission Lines

7. Molecular Bands

8. Temperature Affects Absorption

9. Taking a Temperature

10. Thermal Radiation

11. Color Related to Temperature

12. Spectra in the Lab

13. Spectrum from Mars

14. Doppler Shift

15. Doppler Shifted Spectral Lines

16. Doppler Broadening