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'The combination of multiplicity electrons is impossible' in Gaussian

"The combination of multiplicity 1 and 219 electrons is impossible." 219 is an odd number of electrons. A spin multiplicity of 1 means that there are no unpaired electrons. This means that ...
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How do I do a PES (potential energy surface) scan for the excited electronic state?

To scan the potential energy surface (PES) for an excited electronic state, you can do the same thing that you would do for scanning the PES for the ground electronic state, except that you need to ...
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