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lec 1 - CHM3122 Part 2 KathySarah Focsananu Fox 1 2 3 4 5 6...

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CHM3122’Part’2:’ Kathy-Sarah’ Focsanéanu’(«’Fox’»)’ 1. IntroducAon’to’ photochemistry’ 2. UV-vis’±bsorpAon’ 3. Fluorescence’ 4. (Phosphorescence)’ 5. Infrared’ 6. Mass’ Spectrometry’ CHM3122’ IntroducAon’to’Photochemistry’ 1’
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IntroducAon’to’ Photochemistry’ CHM3122’ IntroducAon’to’Photochemistry’ 2’
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The’ electromagneAc’ spectrum’ CHM3122’ IntroducAon’to’Photochemistry’ 3’ UV IR VISIBLE
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Light:’ Wave’or’ parAcle?’ Both!’ CHM3122’ IntroducAon’to’Photochemistry’ 4’
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The’EM’ spectrum:’ photochemical’ regions’ CHM3122’ IntroducAon’to’Photochemistry’ 5’ 400’to’700’nm Perceived’by’ the’ human’ eye’ 320’to’400’nm Penetrates’glass ’ 280’to’320’nm Blocked’by’ozone ’ <’280’nm ’ Blocked’by’the’ atmosphere’
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ConnecAng’energy’and’wavelength’ CHM3122’ IntroducAon’to’Photochemistry’ 6’ " E = E 2 # E 1 = h $ = c % h = ’Planck ±s’constant’ ’ =’6.626x10 -34 ’ J•s’ ’ =’1.584x10 -37 ’kcal/mol’
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ConnecAng’energy’and’wavelength’ CHM3122’ IntroducAon’to’Photochemistry’ 7’ ! E = hc ! ! E = N A hc ! E = 1.196 " 10 5 (in nm) ( in kJ / mol ) ! E = 2.861 " 10 4 (in nm) ( in kcal / mol )
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Light’absorpAon’ CHM3122’ IntroducAon’to’Photochemistry’ 8’ 100 200 400 700 X-rays’ IR’ UV’ VIS’ Deep’UV’
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Electronic’ExcitaAon’ CHM3122’ IntroducAon’to’Photochemistry’ 9’ HOMO LUMO absorption of a photon Standard abbrevia8on for the absorp8on of light = ground’state’ excited’state’
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First’Law’of’Photochemistry’ CHM3122’ IntroducAon’to’Photochemistry’ 10’ Only’photons’that’are’absorbed’can’induce’a’ photochemical’process’
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