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Understanding IR and Raman Spectra of Water Molecule in C2v Symmetry using Character Tables

Delve into the analysis of IR and Raman spectra of the water molecule in C2v symmetry using a character table. Explore the movement of water molecules with 3 atoms, 9 coordinates, and a 9x9 matrix in the general case. Discover the active modes in Raman and IR spectroscopy, with emphasis on the symmetric flat structure in C2h and CH4 molecules.

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Understanding IR and Raman Spectra of Water Molecule in C2v Symmetry using Character Tables

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Presentation Transcript

  1. Lecture 4 We have a character table What can we say about IR and Raman spectra?

  2. Water molecule C2v

  3. General case: water molecule movement 3 atoms 9 coordinates Matrix 9×9

  4. C2v

  5. 2 1 Water molecule: m = 0; myz =1 m0 =1

  6. Active in Raman Active in IR

  7. Same symmetry: Flat: C2h

  8. CH4 m3=1, m0=1

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