1. PHOTONS IN CHEMISTRY OUT

2. PHOTONS IN CHEMISTRY OUT WHY BOTHER?

3. 1.Remote action

12. Light has: Intensity Color (wavelength) Polarization

15. E = h ν

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

17. 1.Remote action 2.Energetics

18. (wavelength) x (frequency) = speed [m/s] λν = c [10 8 m/s]

20. E = h ν

22. ~ 450-750 nm Take 500 nm

23. Boltzman

24. T [ o K]n 2 /n 1 3003 x 10 -42 4007 x 10 -32 10003.4 x 10 -13 2,0006 x 10 -7 5,0003 x 10 -3 6,4001 % 10,0005.7 % 20,00024 % 50,00056 %

25. Boltzman T [ o K]n 2 /n 1 3003 x 10 -42 4007 x 10 -32 10003.4 x 10 -13 2,0006 x 10 -7 5,0003 x 10 -3 6,4001 % 10,0005.7 % 20,00024 % 50,00056 %

26. Boltzman T [ o K]n 2 /n 1 3003 x 10 -42 4007 x 10 -32 10003.4 x 10 -13 2,0006 x 10 -7 5,0003 x 10 -3 6,4001 % 10,0005.7 % 20,00024 % 50,00056 %

27. Boltzman T [ o K]n 2 /n 1 3003 x 10 -42 4007 x 10 -32 10003.4 x 10 -13 2,0006 x 10 -7 5,0003 x 10 -3 6,4001 % 10,0005.7 % 20,00024 % 50,00056 %

28. Boltzman T [ o K]n 2 /n 1 3003 x 10 -42 4007 x 10 -32 10003.4 x 10 -13 2,0006 x 10 -7 5,0003 x 10 -3 6,4001 % 10,0005.7 % 20,00024 % 50,00056 %

29. 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

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