PSI4 is distributed with an extensive test suite, which can be found in psi4/tests. After building the source code, these can automatically be run by running make tests in the compilation directory. Sample input files can be found in the the psi4/samples subdirectory of the top-level Psi directory. The samples and a brief description are provided below.
Sample inputs accessible through interfaced executables are bulleted below.
Sample inputs for PSI4 as distributed are below.
Input File | Description |
---|---|
cepa0-grad2 | CEPA cc-pVDZ gradient for the NO radical |
pywrap-db2 | Database calculation, run in sow/reap mode. |
cc43 | RHF-CC2-LR/STO-3G optical rotation of (S)-methyloxirane. gauge = both, omega = (589 355 nm) |
mints8 | Patch of a glycine with a methyl group, to make alanine, then DF-SCF energy calculation with the cc-pVDZ basis set |
pywrap-db3 | Test that Python Molecule class processes geometry like psi4 Molecule class. |
omp2-5 | SOS-OMP2 cc-pVDZ geometry optimization for the H2O molecule. |
min_input | This checks that all energy methods can run with a minimal input and set symmetry. |
mp3-grad1 | MP3 cc-pVDZ gradient for the H2O molecule. |
dfscf-bz2 | Benzene Dimer DF-HF/cc-pVDZ |
omp2-3 | OMP2 cc-pVDZ energy for the NO radical |
fnocc3 | Test FNO-QCISD(T) computation |
scf1 | RHF cc-pVQZ energy for the BH molecule, with Cartesian input. |
mp2-grad1 | MP2 cc-pVDZ gradient for the H2O molecule. |
cisd-h2o+-1 | 6-31G** H2O+ Test CISD Energy Point |
scf11-freq-from-energies | Test frequencies by finite differences of energies for planar C4NH4 TS |
sapt2 | SAPT0 aug-cc-pVDZ computation of the benzene-methane interaction energy, using the aug-pVDZ-JKFIT DF basis for SCF, the aug-cc-pVDZ-RI DF basis for SAPT0 induction and dispersion, and the aug-pVDZ-JKFIT DF basis for SAPT0 electrostatics and induction. This example uses frozen core as well as asyncronous I/O while forming the DF integrals and CPHF coefficients. |
mints6 | Patch of a glycine with a methyl group, to make alanine, then DF-SCF energy calculation with the cc-pVDZ basis set |
opt6 | Various constrained energy minimizations of HOOH with cc-pvdz RHF |
mrcc4 | CCSDT cc-pVDZ optimization and frequencies for the H2O molecule using MRCC |
omp3-5 | SOS-OMP3 cc-pVDZ geometry optimization for the H2O molecule. |
cdomp2-1 | OMP2 cc-pVDZ energy for the H2O molecule. |
mp2_5-grad2 | MP2.5 cc-pVDZ gradient for the NO radical |
cc42 | RHF-CC2-LR/STO-3G optical rotation of (S)-methyloxirane. gauge = length, omega = (589 355 nm) |
cc55 | EOM-CCSD/6-31g excited state transition data for water with two excited states per irrep |
zaptn-nh2 | ZAPT(n)/6-31G NH2 Energy Point, with n=2-25 |
dcft1 | DC-06, DC-12, ODC-06 and ODC-12 calculation for the He dimer. This performs a simultaneous update of the orbitals and cumulant, using DIIS extrapolation. Four-virtual integrals are handled in the MO Basis. |
cc35 | CC3(ROHF)/cc-pVDZ H2O ![]() |
ghosts | Density fitted MP2 cc-PVDZ/cc-pVDZ-RI computation of formic acid dimer binding energy using explicit specification of ghost atoms. This is equivalent to the dfmp2_1 sample but uses both (equivalent) specifications of ghost atoms in a manual counterpoise correction. |
mints3 | Test individual integral objects for correctness. |
cc13 | UHF-CCSD/cc-pVDZ ![]() |
cepa2 | cc-pvdz H2O Test ACPF Energy/Properties |
mpn-bh | MP(n)/aug-cc-pVDZ BH Energy Point, with n=2-19. Compare against M. L. Leininger et al., J. Chem. Phys. 112, 9213 (2000) |
psimrcc-ccsd_t-4 | Mk-MRCCSD(T) single point. ![]() |
pywrap-cbs1 | Various basis set extrapolation tests |
cc51 | EOM-CC3/cc-pVTZ on H2O |
dft-pbe0-2 | Internal match to psi4, test to match to literature values in litref.in/litref.out |
cc14 | ROHF-CCSD/cc-pVDZ ![]() |
cc8c | ROHF-CCSD cc-pVDZ frozen-core energy for the ![]() |
dfmp2-3 | DF-MP2 cc-pVDZ frozen core gradient of benzene, computed at the DF-SCF cc-pVDZ geometry |
omp3-4 | SCS-OMP3 cc-pVDZ geometry optimization for the H2O molecule. |
cisd-opt-fd | H2O CISD/6-31G** Optimize Geometry by Energies |
cc13a | UHF-CCSD(T)/cc-pVDZ ![]() |
cc32 | CC3/cc-pVDZ H2O ![]() |
fd-freq-energy-large | SCF DZ finite difference frequencies by energies for C4NH4 |
cc40 | RHF-CC2-LR/cc-pVDZ optical rotation of H2O2. gauge = length, omega = (589 355 nm) |
cc24 | Single point gradient of 1-2B1 state of H2O+ with EOM-CCSD |
cc31 | CCSD/sto-3g optical rotation calculation (both gauges) at two frequencies on methyloxirane |
cisd-sp-2 | 6-31G** H2O Test CISD Energy Point |
cc47 | EOM-CCSD/cc-pVDZ on H2O2 with two excited states in each irrep |
fd-gradient | SCF STO-3G finite-difference tests |
cc22 | ROHF-EOM-CCSD/DZ on the lowest two states of each irrep in ![]() |
omp3-grad2 | OMP3 cc-pVDZ gradient for the NO radical |
scf4 | RHF cc-pVDZ energy for water, automatically scanning the symmetric stretch and bending coordinates using Python’s built-in loop mechanisms. The geometry is apecified using a Z-matrix with variables that are updated during the potential energy surface scan, and then the same procedure is performed using polar coordinates, converted to Cartesian coordinates. |
mp2-def2 | Test case for Binding Energy of C4H5N (Pyrrole) with CO2 using MP2/def2-TZVPP |
cc17 | Single point energies of multiple excited states with EOM-CCSD |
psimrcc-ccsd_t-2 | Mk-MRCCSD(T) single point. ![]() |
dft-b2plyp | Double-hybrid density functional B2PYLP. Reproduces portion of Table I in S. Grimme’s J. Chem. Phys 124 034108 (2006) paper defining the functional. |
psimrcc-fd-freq1 | Mk-MRCCSD single point. ![]() |
cdomp2-2 | OMP2 cc-pVDZ energy for the NO molecule. |
mrcc1 | CCSDT cc-pVDZ energy for the H2O molecule using MRCC |
omp2-grad2 | OMP2 cc-pVDZ gradient for the NO radical |
sapt1 | SAPT0 cc-pVDZ computation of the ethene-ethyne interaction energy, using the cc-pVDZ-JKFIT RI basis for SCF and cc-pVDZ-RI for SAPT. Monomer geometries are specified using Cartesian coordinates. |
dft2 | DFT Functional Test |
cc5a | RHF CCSD(T) STO-3G frozen-core energy of C4NH4 Anion |
mints2 | A test of the basis specification. A benzene atom is defined using a ZMatrix containing dummy atoms and various basis sets are assigned to different atoms. The symmetry of the molecule is automatically lowered to account for the different basis sets. |
cc9 | UHF-CCSD(T) cc-pVDZ frozen-core energy for the ![]() |
psimrcc-sp1 | Mk-MRCCSD single point. ![]() |
cc26 | Single-point gradient, analytic and via finite-differences of 2-1A1 state of H2O with EOM-CCSD |
cc30 | CCSD/sto-3g optical rotation calculation (length gauge only) at two frequencies on methyloxirane |
fd-freq-gradient-large | SCF DZ finite difference frequencies by energies for C4NH4 |
cc1 | RHF-CCSD 6-31G** all-electron optimization of the H2O molecule |
sapt5 | SAPT0 aug-cc-pVTZ computation of the charge transfer energy of the water dimer. |
cc23 | ROHF-EOM-CCSD/DZ analytic gradient lowest ![]() |
ocepa-grad1 | OCEPA cc-pVDZ gradient for the H2O molecule. |
opt3 | SCF cc-pVDZ geometry optimzation, with Z-matrix input |
cc12 | Single point energies of multiple excited states with EOM-CCSD |
psimrcc-ccsd_t-1 | Mk-MRCCSD(T) single point. ![]() |
psimrcc-fd-freq2 | Mk-MRCCSD frequencies. ![]() |
pywrap-db1 | Database calculation, so no molecule section in input file. Portions of the full databases, restricted by subset keyword, are computed by sapt0 and dfmp2 methods. |
opt1-fd | SCF STO-3G geometry optimzation, with Z-matrix input, by finite-differences |
tu4-h2o-freq | Frequencies for H2O HF/cc-pVDZ at optimized geometry |
mrcc3 | CCSD(T) cc-pVDZ geometry optimization for the H2O molecule using MRCC. |
fd-freq-energy | SCF STO-3G finite-difference frequencies from energies |
sapt4 | SAPT2+(3) aug-cc-pVDZ computation of the formamide dimer interaction energy, using the aug-cc-pVDZ-JKFIT DF basis for SCF and aug-cc-pVDZ-RI for SAPT. This example uses frozen core as well as MP2 natural orbital approximations. |
gibbs | Test Gibbs free energies at 298 K of N2, H2O, and CH4. |
cc4 | RHF-CCSD(T) cc-pVQZ frozen-core energy of the BH molecule, with Cartesian input. After the computation, the checkpoint file is renamed, using the PSIO handler. |
pywrap-all | Intercalls among python wrappers- database, cbs, optimize, energy, etc. Though each call below functions individually, running them all in sequence or mixing up the sequence is aspirational at present. Also aspirational is using the intended types of gradients. |
opt2-fd | SCF DZ allene geometry optimzation, with Cartesian input |
cc54 | CCSD dipole with user-specified basis set |
scf-bz2 | Benzene Dimer Out-of-Core HF/cc-pVDZ |
scf2 | RI-SCF cc-pVTZ energy of water, with Z-matrix input and cc-pVTZ-RI auxilliary basis. |
dft-grad | DF-BP86-D2 cc-pVDZ frozen core gradient of S22 HCN |
pywrap-checkrun-convcrit | Advanced python example sets different sets of scf/post-scf conv crit and check to be sure computation has actually converged to the expected accuracy. |
opt1 | SCF STO-3G geometry optimzation, with Z-matrix input |
omp2-grad1 | OMP2 cc-pVDZ gradient for the H2O molecule. |
rasci-h2o | RASCI/6-31G** H2O Energy Point |
dcft3 | DC-06 calculation for the He dimer. This performs a simultaneous update of the orbitals and cumulant, using DIIS extrapolation. Four-virtual integrals are handled in the AO Basis, using integrals stored on disk. |
dcft2 | DC-06 calculation for the He dimer. This performs a two-step update of the orbitals and cumulant, using DIIS extrapolation. Four-virtual integrals are handled in the MO Basis. |
cc3 | cc3: RHF-CCSD/6-31G** H2O geometry optimization and vibrational frequency analysis by finite-differences of gradients |
pywrap-checkrun-rhf | This checks that all energy methods can run with a minimal input and set symmetry. |
cisd-h2o+-0 | 6-31G** H2O+ Test CISD Energy Point |
pywrap-alias | Test parsed and exotic calls to energy() like zapt4, mp2.5, and cisd are working |
omp3-2 | OMP3 cc-pVDZ energy with ROHF initial guess for the NO radical |
omp2_5-1 | OMP2 cc-pVDZ energy for the H2O molecule. |
opt2 | SCF DZ allene geometry optimzation, with Cartesian input |
fnocc2 | Test G2 method for H2O |
omp2-2 | OMP2 cc-pVDZ energy with ROHF initial guess orbitals for the NO radical |
cc18 | RHF-CCSD-LR/cc-pVDZ static polarizability of HOF |
mcscf2 | TCSCF cc-pVDZ energy of asymmetrically displaced ozone, with Z-matrix input. |
fci-h2o-2 | 6-31G H2O Test FCI Energy Point |
pywrap-molecule | Check that C++ Molecule class and qcdb molecule class are reading molecule input strings identically |
mp2-1 | All-electron MP2 6-31G** geometry optimization of water |
mints5 | Tests to determine full point group symmetry. Currently, these only matter for the rotational symmetry number in thermodynamic computations. |
dcft4 | DCFT calculation for the HF+ using DC-06 functional. This performs both two-step and simultaneous update of the orbitals and cumulant using DIIS extrapolation. Four-virtual integrals are first handled in the MO Basis for the first two energy computations. In the next two the ao_basis=disk algorithm is used, where the transformation of integrals for four-virtual case is avoided. The computation is then repeated using the DC-12 functional with the same algorithms. |
cc50 | EOM-CC3(ROHF) on CH radical with user-specified basis and properties for particular root |
cc11 | Frozen-core CCSD(ROHF)/cc-pVDZ on CN radical with disk-based AO algorithm |
frac | Carbon/UHF Fractionally-Occupied SCF Test Case |
castup3 | SCF with various combinations of pk/density-fitting, castup/no-castup, and spherical/cartesian settings. Demonstrates that puream setting is getting set by orbital basis for all df/castup parts of calc. Demonstrates that answer doesn’t depend on presence/absence of castup. Demonstrates (by comparison to castup2) that output file doesn’t depend on options (scf_type) being set global or local. This input uses local. |
omp3-1 | OMP3 cc-pVDZ energy for the H2O molecule |
props2 | DF-SCF cc-pVDZ of benzene-hydronium ion, scanning the dissociation coordinate with Python’s built-in loop mechanism. The geometry is specified by a Z-matrix with dummy atoms, fixed parameters, updated parameters, and separate charge/multiplicity specifiers for each monomer. One-electron properties computed for dimer and one monomer. |
dft1-alt | DFT Functional Test |
omp2_5-grad2 | OMP2.5 cc-pVDZ gradient for the NO radical |
pywrap-basis | SAPT calculation on bimolecular complex where monomers are unspecified so driver auto-fragments it. Basis set and auxiliary basis sets are assigned by atom type. |
fnocc1 | Test QCISD(T) for H2O/cc-pvdz Energy |
psithon1 | Spectroscopic constants of H2, and the full ci cc-pVTZ level of theory |
cc36 | CC2(RHF)/cc-pVDZ energy of H2O. |
omp3-grad1 | OMP3 cc-pVDZ gradient for the H2O molecule. |
cc45 | RHF-EOM-CC2/cc-pVDZ lowest two states of each symmetry of H2O. |
cc16 | UHF-B-CCD(T)/cc-pVDZ ![]() ![]() |
cc53 | Matches Table II a-CCSD(T)/cc-pVDZ H2O @ 2.5 * Re value from Crawford and Stanton, IJQC 98, 601-611 (1998). |
mcscf3 | RHF 6-31G** energy of water, using the MCSCF module and Z-matrix input. |
tu6-cp-ne2 | Example potential energy surface scan and CP-correction for Ne2 |
pywrap-opt-sowreap | Finite difference optimization, run in sow/reap mode. |
sapt3 | SAPT2+3(CCD) aug-cc-pVDZ computation of the water dimer interaction energy, using the aug-cc-pVDZ-JKFIT DF basis for SCF and aug-cc-pVDZ-RI for SAPT. |
ocepa1 | OCEPA cc-pVDZ energy for the H2O molecule. |
ci-multi | BH single points, checking that program can run multiple instances of DETCI in a single input, without an intervening clean() call |
mrcc2 | CCSDT(Q) cc-pVDZ energy for the H2O molecule using MRCC. This example builds up from CCSD. First CCSD, then CCSDT, finally CCSDT(Q). |
fci-tdm-2 | BH-H2+ FCI/cc-pVDZ Transition Dipole Moment |
cc9a | ROHF-CCSD(T) cc-pVDZ energy for the ![]() |
cisd-sp | 6-31G** H2O Test CISD Energy Point |
pywrap-freq-e-sowreap | Finite difference of energies frequency, run in sow/reap mode. |
dfmp2-4 | conventional and density-fitting mp2 test of mp2 itself and setting scs-mp2 |
dcft7 | DCFT calculation for the triplet O2 using ODC-06 and ODC-12 functionals. Only simultaneous algorithm is tested. |
props1 | RHF STO-3G dipole moment computation, performed by applying a finite electric field and numerical differentiation. |
mints4 | A demonstration of mixed Cartesian/ZMatrix geometry specification, using variables, for the benzene-hydronium complex. Atoms can be placed using ZMatrix coordinates, whether they belong to the same fragment or not. Note that the Cartesian specification must come before the ZMatrix entries because the former define absolute positions, while the latter are relative. |
cc4a | RHF-CCSD(T) cc-pVQZ frozen-core energy of the BH molecule, with Cartesian input. This version tests the FROZEN_DOCC option explicitly |
cc5 | RHF CCSD(T) aug-cc-pvtz frozen-core energy of C4NH4 Anion |
cc38 | RHF-CC2-LR/cc-pVDZ static polarizabilities of HOF molecule. |
psimrcc-pt2 | Mk-MRPT2 single point. ![]() |
opt7 | Various constrained energy minimizations of HOOH with cc-pvdz RHF. For the “frozen” bonds, angles and dihedrals, these coordinates are constrained to remain at their initial values. For “fixed” bonds, angles, or dihedrals, the equilibrium (final) value of the coordinate is provided by the user. |
cisd-h2o-clpse | 6-31G** H2O Test CISD Energy Point with subspace collapse |
cc27 | Single point gradient of 1-1B2 state of H2O with EOM-CCSD |
cc37 | CC2(UHF)/cc-pVDZ energy of H2O+. |
fci-dipole | 6-31G H2O Test FCI Energy Point |
scf5 | Test of all different algorithms and reference types for SCF, on singlet and triplet O2, using the cc-pVTZ basis set. |
cc8b | ROHF-CCSD cc-pVDZ frozen-core energy for the ![]() |
fnocc4 | Test FNO-DF-CCSD(T) energy |
cisd-h2o+-2 | 6-31G** H2O+ Test CISD Energy Point |
dfomp2-4 | OMP2 cc-pVDZ energy for the NO molecule. |
fci-tdm | He2+ FCI/cc-pVDZ Transition Dipole Moment |
pywrap-checkrun-uhf | This checks that all energy methods can run with a minimal input and set symmetry. |
adc2 | ADC/aug-cc-pVDZ on two water molecules that are distant from 1000 angstroms from each other |
dfomp2-2 | OMP2 cc-pVDZ energy for the NO molecule. |
dft3 | DFT integral algorithms test, performing w-B97 RKS and UKS computations on water and its cation, using all of the different integral algorithms. This tests both the ERI and ERF integrals. |
cc8 | UHF-CCSD(T) cc-pVDZ frozen-core energy for the ![]() |
dfomp2-3 | OMP2 cc-pVDZ energy for the H2O molecule. |
omp2_5-grad1 | OMP2.5 cc-pVDZ gradient for the H2O molecule. |
dft1 | DFT Functional Test |
castup2 | SCF with various combinations of pk/density-fitting, castup/no-castup, and spherical/cartesian settings. Demonstrates that puream setting is getting set by orbital basis for all df/castup parts of calc. Demonstrates that answer doesn’t depend on presence/absence of castup. Demonstrates (by comparison to castup3) that output file doesn’t depend on options (scf_type) being set global or local. This input uses global. |
scf6 | Tests RHF/ROHF/UHF SCF gradients |
cepa1 | cc-pvdz H2O Test CEPA(1) Energy |
ocepa-freq1 | OCEPA cc-pVDZ freqs for C2H2 |
cc48 | reproduces dipole moments in J.F. Stanton’s “biorthogonal” JCP paper |
rasci-c2-active | 6-31G* C2 Test RASCI Energy Point, testing two different ways of specifying the active space, either with the ACTIVE keyword, or with RAS1, RAS2, RESTRICTED_DOCC, and RESTRICTED_UOCC |
mp2-grad2 | MP2 cc-pVDZ gradient for the NO radical |
dfmp2-2 | Density fitted MP2 energy of H2, using density fitted reference and automatic looping over cc-pVDZ and cc-pVTZ basis sets. Results are tabulated using the built in table functions by using the default options and by specifiying the format. |
mints1 | Symmetry tests for a range of molecules. This doesn’t actually compute any energies, but serves as an example of the many ways to specify geometries in Psi4. |
cc28 | CCSD/cc-pVDZ optical rotation calculation (length gauge only) on Z-mat H2O2 |
pywrap-checkrun-rohf | This checks that all energy methods can run with a minimal input and set symmetry. |
tu2-ch2-energy | Sample UHF/6-31G** CH2 computation |
cc46 | EOM-CC2/cc-pVDZ on H2O2 with two excited states in each irrep |
cc25 | Single point gradient of 1-2B2 state of H2O+ with EOM-CCSD |
opt5 | 6-31G** UHF CH2 3B1 optimization. Uses a Z-Matrix with dummy atoms, just for demo and testing purposes. |
fci-h2o | 6-31G H2O Test FCI Energy Point |
omp2-1 | OMP2 cc-pVDZ energy for the H2O molecule. |
tu5-sapt | Example SAPT computation for ethene*ethine (i.e., ethylene*acetylene), test case 16 from the S22 database |
mp3-grad2 | MP3 cc-pVDZ gradient for the NO radical |
psimrcc-ccsd_t-3 | Mk-MRCCSD(T) single point. ![]() |
omp2_5-2 | OMP2 cc-pVDZ energy for the H2O molecule. |
cc15 | RHF-B-CCD(T)/6-31G** H2O single-point energy (fzc, MO-basis ![]() |
opt4 | SCF cc-pVTZ geometry optimzation, with Z-matrix input |
ocepa3 | OCEPA cc-pVDZ energy with ROHF initial guess for the NO radical |
dft-dldf | Dispersionless density functional (dlDF+D) internal match to Psi4 Extensive testing has been done to match supplemental info of Szalewicz et. al., Phys. Rev. Lett., 103, 263201 (2009) and Szalewicz et. al., J. Phys. Chem. Lett., 1, 550-555 (2010) |
ocepa2 | OCEPA cc-pVDZ energy with B3LYP initial guess for the NO radical |
cc19 | CCSD/cc-pVDZ dipole polarizability at two frequencies |
cc39 | RHF-CC2-LR/cc-pVDZ dynamic polarizabilities of HOF molecule. |
omp2-4 | SCS-OMP2 cc-pVDZ geometry optimization for the H2O molecule. |
cc33 | CC3(UHF)/cc-pVDZ H2O ![]() |
cepa0-grad1 | CEPA0 cc-pVDZ gradient for the H2O molecule. |
cc21 | ROHF-EOM-CCSD/DZ analytic gradient lowest ![]() |
cc52 | CCSD Response for H2O2 |
cc8a | ROHF-CCSD(T) cc-pVDZ frozen-core energy for the ![]() |
dfmp2-1 | Density fitted MP2 cc-PVDZ/cc-pVDZ-RI computation of formic acid dimer binding energy using automatic counterpoise correction. Monomers are specified using Cartesian coordinates. |
dcft5 | DC-06 calculation for the O2 molecule (triplet ground state). This performs geometry optimization using two-step and simultaneous solution of the response equations for the analytic gradient. |
cc49 | EOM-CC3(UHF) on CH radical with user-specified basis and properties for particular root |
tu3-h2o-opt | Optimize H2O HF/cc-pVDZ |
psithon2 | Accesses basis sets, databases, plugins, and executables in non-install locations |
dfomp2-1 | OMP2 cc-pVDZ energy for the H2O molecule. |
adc1 | ADC/6-31G** on H2O |
cc34 | RHF-CCSD/cc-pVDZ energy of H2O partitioned into pair energy contributions. |
tu1-h2o-energy | Sample HF/cc-pVDZ H2O computation |
omp3-3 | OMP3 cc-pVDZ energy with B3LYP initial guess for the NO radical |
dcft-grad1 | DCFT DC-06 gradient for the O2 molecule with cc-pVDZ basis set |
rasci-ne | Ne atom RASCI/cc-pVQZ Example of split-virtual CISD[TQ] from Sherrill and Schaefer, J. Phys. Chem. XXX This uses a “primary” virtual space 3s3p (RAS 2), a “secondary” virtual space 3d4s4p4d4f (RAS 3), and a “tertiary” virtual space consisting of the remaining virtuals. First, an initial CISD computation is run to get the natural orbitals; this allows a meaningful partitioning of the virtual orbitals into groups of different importance. Next, the RASCI is run. The split-virtual CISD[TQ] takes all singles and doubles, and all triples and quadruples with no more than 2 electrons in the secondary virtual subspace (RAS 3). If any electrons are present in the tertiary virtual subspace (RAS 4), then that excitation is only allowed if it is a single or double. |
pubchem1 | Benzene vertical singlet-triplet energy difference computation, using the PubChem database to obtain the initial geometry, at the UHF an ROHF levels of theory. |
props3 | DF-SCF cc-pVDZ multipole moments of benzene, up to 7th order and electrostatic potentials evaluated at the nuclear coordinates |
fd-freq-gradient | STO-3G frequencies for H2O by finite-differences of gradients |
scf-guess-read | Sample UHF/cc-pVDZ H2O computation on a doublet cation, using RHF/cc-pVDZ orbitals for the closed-shell neutral as a guess |
matrix1 | An example of using BLAS and LAPACK calls directly from the Psi input file, demonstrating matrix multiplication, eigendecomposition, Cholesky decomposition and LU decomposition. These operations are performed on vectors and matrices provided from the Psi library. |
mp2_5-grad1 | MP2.5 cc-pVDZ gradient for the H2O molecule. |
dft-freq | Frequencies for H2O B3LYP/6-31G* at optimized geometry |
cc6 | Frozen-core CCSD(T)/cc-pVDZ on C4H4N anion with disk ao algorithm |
mom | Maximum Overlap Method (MOM) Test. MOM is designed to stabilize SCF convergence and to target excited Slater determinants directly. |
ocepa-grad2 | OCEPA cc-pVDZ gradient for the NO radical |
cepa3 | cc-pvdz H2O Test coupled-pair CISD against DETCI CISD |
cc2 | 6-31G** H2O CCSD optimization by energies, with Z-Matrix input |
fci-h2o-fzcv | 6-31G H2O Test FCI Energy Point |
scf3 | are specified explicitly. |
dcft6 | DCFT calculation for the triplet O2 using DC-06, DC-12 and CEPA0 functionals. Only two-step algorithm is tested. |
castup1 | Test of SAD/Cast-up (mainly not dying due to file weirdness) |
cc10 | ROHF-CCSD cc-pVDZ energy for the ![]() |
cc44 | Test case for some of the PSI4 out-of-core codes. The code is given only 2.0 MB of memory, which is insufficient to hold either the A1 or B2 blocks of an ovvv quantity in-core, but is sufficient to hold at least two copies of an oovv quantity in-core. |
cc29 | CCSD/cc-pVDZ optical rotation calculation (both gauges) on Cartesian H2O2 |
mcscf1 | ROHF 6-31G** energy of the ![]() |
dft-psivar | HF and DFT variants single-points on zmat methane, mostly to test that PSI variables are set and computed correctly. |
cc41 | RHF-CC2-LR/cc-pVDZ optical rotation of H2O2. gauge = both, omega = (589 355 nm) |
sad1 | Test of the superposition of atomic densities (SAD) guess, using a highly distorted water geometry with a cc-pVDZ basis set. This is just a test of the code and the user need only specify guess=sad to the SCF module’s (or global) options in order to use a SAD guess. The test is first performed in C2v symmetry, and then in C1. |