1. Spectroscopy Objectives –Understand the relationship between light, color, energy, frequency and wavelength of light –Understand how light interacts with matter (atoms and molecules) –Understand the process of light emission and absorption from atoms –Differentiate between continuous, emission and absorption spectra

2. COMBINING LIGHT Two sets of primary colors: Red, Green, Blue Cyan, Yellow, Magenta

3. Combining Color Images

4. Continuous Spectrum A Simple Spectragraph

5. White Crepe Murtle 1.0 B G R

6. Absorption Spectra of Purple Flower Pigments

7. Light Purple Crepe Murtle 1.0 B G R

8. Energy Level Schematic Solar System Analogy for an... Atom –Massive StarMassive Nucleus –Planets in orbitElectrons in Orbit –Kepler’s LawsConservation of Energy and Angular Momentum Nucleus Electron Energy Levels

9. Emission Spectrum Seen against the background of space, only the photons emitted by the excited atoms in the gas are seen. These wavelengths only come from allowed energies in the atoms of the gas.

10. Absorption Spectrum Photons with the correct energy, are absorbed by the gas surrounding the continuous source. They are re-radiated in all directions yielded a decrease in light from wavelengths corresponding to the energies of atoms in the gas.

11. Atomic Spectra Mug Shots

12. Interaction of Light with Matter Hydrogen

13. The Visible Solar Spectrum Absorption Spectrum: Continuous spectrum with absorption lines