L6 - Reflection about xy plane xy xz Transition dipoles xy...

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Biophysical Chemistry Chemistry 24a Winter Term 2009-10 Instructor: Sunney I. Chan Lecture 6 January 15, 2010 Selection Rules. Electronic Spectroscopy of Biological Chromophores Absorption and Emission Spectroscopy ħ 2 ) B coefficients for stimulated absorption and emission of light r initial state final state
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Selection Rules for Simple Situations Selection rules determined by symmetry! (symmetric function) (antisymmetric function)
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“fundamental” “lst overtone” “lst hot band”
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e.g. V(x) = ½ k x 2 + a x 4 or V(x) = a x 4 ( pure quartic oscillator ) Problem has spherical symmetry!
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) Molecular orbitals There are only two planes of symmetry for formaldehyde. Reflections Reflection about z plane
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Unformatted text preview: Reflection about xy plane xy xz Transition dipoles xy xz * LUMO x HOMO * LUMO y HOMO * LUMO z HOMO Transition induced by x interacting with E x (x-polarized) Transition induced by y interacting with E y (y-polarized) Transition induced by z interacting with E z (z-polarized) Integrand Biological Chromophores Biological Chromophores Biological Chromophores Biological Chromophores Biological Chromophores Biological Chromophores Biological Chromophores Reading assignment James P. Allen, Chapter 14, pp. 291-302. Suggested reading Eisenberg and Crothers (EC), Chapter 13, pp. 562-581....
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L6 - Reflection about xy plane xy xz Transition dipoles xy...

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