nopen for biradical singlet


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Tiechong
You need to set nopen=1 and, at the same time, force the starting guess to get you towards the biradical singlet solution.
You might want to have a look at an earlier posting(s) on this topic
http://nwchemgit.github.io/Special_AWCforum/sp/id976

Please let us know if this addresses your problem.
If this does not help, please send us more details about it.

Cheers, Edo