This lecture video shows how to assign Mulliken notation labels to vibrational arrow diagrams and molecular orbital images. You must already know the Point Group of the molecule and must have the character table available for the molecule you are inspecting.
For assigning point groups go to symotter.org.
To find the character tables online go to Jacobs U.
Here is the YouTube Tutorial.

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This is a part of a series of pages that serve as a static set of URLs to be used in the references section of my book Spectroscopy Theory in One Dimension through AIP Press.