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PHOTONS IN CHEMISTRY OUT

PHOTONS IN CHEMISTRY OUT. PHOTONS IN CHEMISTRY OUT. WHY BOTHER?. Remote action. Remote action. Light has: Intensity Color (wavelength) Polarization. E = h ν. Light has: Intensity Color (wavelength) = ENERGY Polarization. Remote action Energetics.

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PHOTONS IN CHEMISTRY OUT

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  1. PHOTONS IN CHEMISTRY OUT

  2. PHOTONS IN CHEMISTRY OUT WHY BOTHER?

  3. Remote action

  4. Remote action

  5. Light has: • Intensity • Color (wavelength) • Polarization

  6. E = h ν

  7. Light has: • Intensity • Color (wavelength) = ENERGY • Polarization

  8. Remote action • Energetics

  9. (wavelength) x (frequency) = speed [m/s] λν = c [108 m/s]

  10. E = h ν

  11. Visible light from the sun ~ 450-750 nm Take 500 nm electronic state

  12. Boltzman

  13. Boltzman

  14. Boltzman

  15. Boltzman

  16. Boltzman

  17. Boltzman

  18. Grotthuss-Draper law: Only the light absorbed in a molecule can produce photochemical Change in the molecule (1871 and 1841) Stark - Einstein: If a species absorbs radiation, then one particle is excited for each quantum of radiation absorbed

  19. PrimaryΦ≤ 1 Sum of all primary Φ’s =1 QUANTUM YIELD: Φ = The number of molecules of reactant consumed for each quantum of radiation absorbed Stark - Einstein: If a species absorbs radiation, then one particle is excited for each quantum of radiation absorbed

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