psi4.driver.vibanal_wfn(wfn, hess=None, irrep=None, molecule=None, project_trans=True, project_rot=True)[source]

Function to perform analysis of a hessian or hessian block, specifically… calling for and printing vibrational and thermochemical analysis, setting thermochemical variables, and writing the vibrec and normal mode files.

  • wfn (Wavefunction) – The wavefunction which had its Hessian computed.

  • hess (Optional[ndarray]) – Hessian to analyze, if not the hessian in wfn. (3*nat, 3*nat) non-mass-weighted Hessian in atomic units, [Eh/a0/a0].

  • irrep (Union[int, str, None]) – The irrep for which frequencies are calculated. Thermochemical analysis is skipped if this is specified (non-None), as only one symmetry block of the hessian has been computed.

  • molecule (Molecule or qcdb.Molecule, optional) – The molecule to pull information from, if not the molecule in wfn. Must at least have similar geometry to the molecule in wfn.

  • project_trans (bool) – Should translations be projected in the harmonic analysis?

  • project_rot (bool) – Should rotations be projected in the harmonic analysis?


vibinfo – A dictionary of vibrational information. See harmonic_analysis()

Return type:

Dict[str, ndarray]