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New: Vibrational analysis with projection of translations and rotations #565

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@avcopan avcopan commented Aug 30, 2024

automol.geom.vibrational_analysis(geo, hess) -> freqs, norm_coos

This returns the frequencies and normal coordinates for internal vibrations (translations and rotations are projected out).

These will be used to project out translations and rotations.
Next I need to make sure it handles diatomics as well...
Also, defines rotational modes to match the current frame of the molecule,
rather than the Eckart frame. If all 3 rotations are being projected out, this
isn't an issue, but if we ant to choose only 2, the frames need to match.
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