To my mind http://jmol.sourceforge.net/demo/vibration/ is an
excellent way of displaying all the various vibrations a molecule can
undergo.
But based on Bob Hansons recent comments on Gaussian file
parsing I wonder if now is a good time to suggest that the vibration
output from Spartan 04 should be considered for automatic parsing
by Jmol.
This would allow easy use of Spartan04 output in vibrational
displays.
Benzene vibrations from Spartan04
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Support has been added to Jmol, but that's in Java...