1 Light has: Intensity Color (wavelength) Polarization

2 E = h ν

3

4

5

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7

8

9

10

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12 o

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15 The fraction of atoms in the excited state is still less than 0.02%,but that fraction has increased by 100(1.74 – 1.67)/1.67 = 4% The fraction of atoms in the ground state is still more than 99.98%, and that fraction has increased by 100x7x10-6/.9998 = 7x10-4%

16 Linewidth

17

18

19 ATR

20 ATR

21 ATR

22 ATR

23 Fourier transform IR

24 Fourier transform IR

25 Electromagnetic RadiationPolarization

26 Polarization Unpolarized light

27 Polarized light Polarization

28 Polarization Polarizing sun glasses reduce glare of polarized reflections from surfaces

29 Polarization

30 Polarization (b)

31 Polarization Mirror image of hand

32 Optical Isomer and Interaction with LightPolarization Optical Isomer and Interaction with Light Enatiomers rotate the plane of polarized light. Dextrorotatory- “d” isomer Complex which rotates plane of polarized light to the right. Levorotatory- “l” isomer Complex which rotates plane of polarized light to the left. Chiral molecules are optically active because effect on light

33 Polarization