Closed bzhang25 closed 7 years ago
I am not sure what context you are using this, but I noticed recently that relativistic NEVPT2 is ill-defined. NEVPT2 is not orbital invariant with respect to the active rotations, and relativistic CASSCF orbitals have Kramers degeneracy (hence, the results seem to be somewhat arbitrary). My suggestion is not to use it.
I will close it for now as I have no plan to fix this problem.
PS: I am talking about strongly contracted variants of NEVPT2.
I am trying to run a relativistic NEVPT2 job on Fluorine atom. It seems that I cannot have the number of orbitals closed in the zcasscf be equal to the orbitals frozen in the dnevpt2 calculation. This was noted in issue #80 for MRCI, which now appears to have been fixed. CASPT2 runs without problems as well. While the NEVPT2 job runs fine when ncore = 0, we would like to be able to freeze the core in order to be consistent with other computations.
This is the input I used:
This is the error message I receive:
Is there currently a solution that will allow us to freeze the core in when it is equal to the number of closed orbitals specified in zcasscf?
Thanks!