L1 - light wave. Unpolarized light : E* direction of...

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Biophysical Chemistry Chemistry 24a Winter Term 2009-10 Instructor: Sunney I. Chan Lecture 1 January 4, 2010 Introduction to Spectroscopy Interaction of light with matter
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Superimposition of scattering events from multiple scatterers backscattering forward scattering Luminescence also chemi-luminescence Light is a traveling plane wave. E(r, t) = E o e i(k·r- ω t) If wave is propagating in the +z direction, E(z, t) = E o e i(kz- ω t) E o is the amplitude of the wave, k = 2 π / λ , ( λ is the wavelength ) ω = 2 π ν , ( ν is the frequency of the light ) and ν λ = c . ( c is the speed of light ) c = 299,792,458 meters/sec or 2.998 × 10 8 m/s or 3 × 10 10 cm/s Polarization of light Polarized light : If all the waves have the same E linearly polarized as above, the light is plane polarized (plane defined by the electric field direction and the direction of propagation of the
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Unformatted text preview: light wave. Unpolarized light : E* direction of propagation of light Z y x x y E is viewed along z-direction wave is linearly polarized along x-direction E of different waves as viewed along direction of propagation. electric fields oscillating in all directions At a given time t Linearly versus Circularly Polarized Light 1 nm 10 10 2 10 3 10 4 10 5 10 6 10 7 Frequency X-ray UV/Vis Infrared Far Infrared Microwave Radio Transition Electronic Vibration Rotation Nuclear /Electron spin spin Spectrometer X-ray UV/VIS/Raman Infrared Microwave/EPR NMR Fluorescence Various Forms of Spectroscopy Where does it occur? 10 8 10 9 Study Table 12-2, pp. 530-531 in Chapter 12 of text by Eisenberg and Crothers. Suggested reading Eisenberg and Crothers (EC), Chapter 12, pp. 516-535....
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L1 - light wave. Unpolarized light : E* direction of...

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