Manfra26-2011

Manfra26-2011 - Intro to Lasers CHAPTER 10 Molecules and...

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Unformatted text preview: Intro to Lasers CHAPTER 10 Molecules and Solids Molecules and Solids Johannes Diderik van der Waals (1837 1923) You little molecule!- Fred Flintstone (insulting his friend Barney Rubble) Atomic and molecular vibrations correspond to excited energy levels in quantum mechanics. Energy Ground level Excited level E = h The atom is at least partially in an excited state. The atom is vibrating at frequency, . Energy levels are everything in quantum mechanics. Atoms and molecules can also absorb photons, making a transition from a lower level to a more excited one. This is, of course, absorption. Energy Ground level Excited level Absorption lines in an otherwise continuous light spectrum due to a cold atomic gas in front of a hot source. Excited atoms emit photons spontaneously. When an atom in an excited state falls to a lower energy level, it emits a photon of light. Molecules typically remain excited for no longer than a few nanoseconds. This is often also called fluorescence or, when it takes longer, phosphorescence . Energy Ground level Excited level Decay from an excited state can occur in many steps. Energy The light thats eventually re-emitted after absorption may occur at other colors....
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Manfra26-2011 - Intro to Lasers CHAPTER 10 Molecules and...

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