Determine the symmetries of all of the acetylene

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Unformatted text preview: termine the symmetries of all of the acetylene vibrations; remember that rotation around the axis (i.e. the molecular axis) is trivial and not therefore a meaningful degree of freedom. In , the translations are these from gives and the two nontrivial rotations are . . Removing b. (4 points) How many normal modes are potentially active in an IR spectrum? In a Raman spectrum? The and axes transform as and , so there are three potentially IR active modes, should be degenerate and give rise to only vibrations (though two of them, the one IR band). The second order functions (e.g. ) transform as , , and , so there are four potentially Raman active modes (but once again, the modes would be degenerate and give rise to a single band). c. (4...
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