CCWavefunction¶
- class psi4.core.CCWavefunction¶
Bases:
Wavefunction
Specialized Wavefunction used by the ccenergy, cceom, ccgradient, etc. modules.
Methods Summary
get_amplitudes
(self)Get dict of converged T amplitudes.
total_index
(self, i, h)Map an index (i) within irrep (h) to its energy-sorted index among all roots.
Methods Documentation
- get_amplitudes(self: psi4.core.CCWavefunction) Dict[str, psi4.core.Matrix] ¶
Get dict of converged T amplitudes.
- Returns:
amps (dict (spacestr, SharedMatrix)) – spacestr is a description of the amplitude set using the following conventions.
I,J,K -> alpha occupied
i,j,k -> beta occupied
A,B,C -> alpha virtual
a,b,c -> beta virtual
The following entries are stored in the amps, depending on the reference type
RHF (tIA, tIjAb)
UHF (tIA, tia, tIjAb, tIJAB, tijab)
ROHF (tIA, tia, tIjAb, tIJAB, tijab)
Examples
RHF T1 diagnostic = sqrt(sum_ia (T_ia * T_ia)/nelec) >>> mol = “”” … 0 1 … Ne 0.0 0.0 0.0 … symmetry c1””” >>> e, wfn = psi4.energy(“CCSD/cc-pvdz”, return_wfn=True) >>> t1 = wfn.get_amplitudes()[‘tia’].to_array() >>> t1_diagnostic = np.sqrt(np.dot(t1.ravel(),t1.ravel())/ (2 * wfn.nalpha()) >>> t1_diagnostic == psi4.variable(“CC T1 DIAGNOSTIC”) True
Warning
Symmetry free calculations only (nirreps > 1 will cause error)
Warning
No checks that the amplitudes will fit in core. Do not use for proteins
- total_index(self: psi4.core.CCWavefunction, i: int, h: int) int ¶
Map an index (i) within irrep (h) to its energy-sorted index among all roots.