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(June 30, 2021)

CC_STATE_TO_OPT

Specifies which state to optimize (or from which state compute EOM-EOM inter-state
properties).

TYPE:

INTEGER ARRAY

DEFAULT:

None

OPTIONS:

[$i$,$j$]
optimize the $j$th state of the $i$th irrep.

RECOMMENDATION:

None

Note: The state number should be smaller or equal to the number of excited states calculated in the corresponding irrep.

Note:
If analytic gradients are not available, the finite difference
calculations will be performed and the symmetry will be turned off. In this
case, CC_STATE_TO_OPT should be specified assuming C${}_{\mathrm{1}}$ symmetry,
*i.e.*, as [1,N] where N is the number of state to optimize (the states are
numbered from 1).

CC_EOM_PROP

Whether or not the non-relaxed (expectation value) one-particle EOM-CCSD
target state properties will be calculated. The properties currently include
permanent dipole moment, angular momentum projections, the second moments $\u27e8{X}^{2}\u27e9$, $\u27e8{Y}^{2}\u27e9$, and
$\u27e8{Z}^{2}\u27e9$ of electron density, and the total $\u27e8{R}^{2}\u27e9=\u27e8{X}^{2}\u27e9+\u27e8{Y}^{2}\u27e9+\u27e8{Z}^{2}\u27e9$ (in atomic units). Incompatible with
JOBTYPE = FORCE, OPT, FREQ.

TYPE:

LOGICAL

DEFAULT:

FALSE (no one-particle properties will be calculated)

OPTIONS:

FALSE, TRUE

RECOMMENDATION:

Additional equations (EOM-CCSD equations for the left eigenvectors) need to be
solved for properties, approximately doubling the cost of calculation for each
irrep.
The cost of the one-particle properties calculation itself is low. The
one-particle density of an EOM-CCSD target state can be analyzed with NBO or
libwfa packages by specifying the state with CC_STATE_TO_OPT and
requesting NBO = TRUE and CC_EOM_PROP = TRUE.

CC_TRANS_PROP

Whether or not the transition dipole moment (in atomic units) and oscillator
strength and rotatory strength (in atomic units)
for the EOM-CCSD target states will be calculated. By default, the
transition dipole moment, angular momentum matrix elements,
and rotatory strengths
are calculated between the CCSD reference and the
EOM-CCSD target states. In order to calculate transition dipole moment, angular momentum matrix elements,
and rotatory strengths between a set of EOM-CCSD states and another EOM-CCSD state, the
CC_STATE_TO_OPT
must be specified for this state.

TYPE:

INTEGER

DEFAULT:

0 (no transition properties will be calculated)

OPTIONS:

1 (calculate transition properties between all computed EOM state and the reference state)
2 (calculate transition properties between all pairs of EOM states)

RECOMMENDATION:

Additional equations (for the left EOM-CCSD eigenvectors plus lambda CCSD
equations in case of transition properties between the CCSD reference and
EOM-CCSD target states are requested) need to be solved for transition
properties, approximately doubling the computational cost. The cost of the
transition properties calculation itself is low.

Note:
When *$trans_prop* section is present in the input, it disables
CC_TRANS_PROP rem.

CC_EOM_2PA

Whether or not the transition moments and cross-sections for two-photon
absorption will be calculated. By default, the
transition moments are calculated between the CCSD reference and the
EOM-CCSD target states. In order to calculate transition moments between
a set of EOM-CCSD states and another EOM-CCSD state, the
CC_STATE_TO_OPT must be specified for this state.
If 2PA NTO analysis is requested, the CC_EOM_2PA value is redundant
as long as CC_EOM_2PA $>0$.

TYPE:

INTEGER

DEFAULT:

0 (do not compute 2PA transition moments)

OPTIONS:

1
Compute 2PA using the fastest algorithm (use $\stackrel{~}{\sigma}$-intermediates for
canonical
and $\sigma $-intermediates for RI/CD response calculations).
2
Use $\sigma $-intermediates for 2PA response equation calculations.
3
Use $\stackrel{~}{\sigma}$-intermediates for 2PA response equation calculations.

RECOMMENDATION:

Additional response equations (6 for each target state) will be solved,
which increases the cost of calculations. The cost of 2PA
moments is about 10 times that of energy calculation.
Use the default algorithm.
Setting CC_EOM_2PA $>0$ turns on CC_TRANS_PROP.

CALC_SOC

Whether or not the spin-orbit couplings between CC/EOM/ADC/CIS/TDDFT electronic states
will be calculated. In the CC/EOM-CC suite, by default the couplings are calculated between
the CCSD reference and the EOM-CCSD target states. In order to calculate
couplings between EOM states, CC_STATE_TO_OPT must specify
the initial EOM state. If NTO analysis is requested, analysis of spinless transition density matrices
will be performed and the spin–orbit integrals over NTO pairs will be printed.

TYPE:

INTEGER/LOGICAL

DEFAULT:

FALSE (no spin-orbit couplings will be calculated)

OPTIONS:

0/FALSE
(no spin-orbit couplings will be calculated)
1/TRUE
Activates SOC calculation. EOM-CC/EOM-MP2 only: spin-orbit couplings will be computed with the new code with L+/L- averaging
2
EOM-CC/EOM-MP2 only: spin-orbit couplings will be computed with the new code without L+/L- averaging
3
EOM-CC/EOM-MP2 only: spin-orbit couplings will be computed with the legacy code

RECOMMENDATION:

CCMAN2 supports several variants of SOC calculation for EOM-CC/EOM-MP2 methods.
One-electron and mean-field two-electron SOCs will be computed by default.
To enable full two-electron SOCs, two-particle EOM properties must be
turned on (see CC_EOM_PROP_TE).

CALC_NAC

Whether or not non-adiabatic couplings
will be calculated for the EOM-CC, CIS, and TDDFT wave functions.

TYPE:

INTEGER

DEFAULT:

0 (do not compute NAC)

OPTIONS:

1
NYI for EOM-CC
2
Compute NACs using Szalay’s approach (this what needs to be specified for EOM-CC).

RECOMMENDATION:

Additional response equations will be solved and gradients for all EOM states and
for summed states will be computed,
which increases the cost of calculations.
Request only when needed and do not ask for too many EOM states.

CC_POL

Specifies the approach for calculating the polarizability of the CCSD wave function.

TYPE:

INTEGER

DEFAULT:

0
(CCSD polarizability will not be calculated)

OPTIONS:

1
(analytic-derivative or response-theory mixed symmetric-asymmetric approach)
2
(analytic-derivative or response-theory asymmetric approach)
3
(expectation-value approach with right response intermediates)
4
(expectation-value approach with left response intermediates)

RECOMMENDATION:

CCSD polarizabilities are expensive since they require solving
three/six (for static) or six/twelve (for dynamical)
additional response equations. Do no request this property unless you need it.

EOM_POL

Specifies the approach for calculating the polarizability of the EOM-CCSD wave function.

TYPE:

INTEGER

DEFAULT:

0
(EOM-CCSD polarizability will not be calculated)

OPTIONS:

1
(analytic-derivative or response-theory mixed symmetric-asymmetric approach)
2
(analytic-derivative or response-theory asymmetric approach)
3
(expectation-value approach with right response intermediates)
4
(expectation-value approach with left response intermediates)

RECOMMENDATION:

EOM-CCSD polarizabilities are expensive since they require solving
three/nine (for static) or six/eighteen (for dynamical)
additional response equations. Do no request this property unless you need it.

CC_EOM_PROP_TE

Request for calculation of non-relaxed two-particle EOM-CC properties. The
two-particle properties currently include $\u27e8{S}^{2}\u27e9$. The one-particle
properties also will be calculated, since the additional cost of the
one-particle properties calculation is inferior compared to the cost of
$\u27e8{S}^{2}\u27e9$. The variable CC_EOM_PROP must be also set to
TRUE. Alternatively, CC_CALC_SSQ can be used to
request $\u27e8{S}^{2}\u27e9$ calculation.

TYPE:

LOGICAL

DEFAULT:

FALSE
(no two-particle properties will be calculated)

OPTIONS:

FALSE, TRUE

RECOMMENDATION:

The two-particle properties are computationally expensive since
they require calculation and use of the two-particle density matrix (the cost
is approximately the same as the cost of an analytic gradient calculation). Do
not request the two-particle properties unless you really need them.

CC_FULLRESPONSE

Fully relaxed properties (with or without orbital relaxation terms) will be computed.
The variable CC_EOM_PROP must be also set to TRUE.

TYPE:

INTEGER

DEFAULT:

0
(no amplitude and orbital response will be calculated)

OPTIONS:

1
(both amplitude and orbital response will be calculated)
2
(only amplitude response will be calculated)

RECOMMENDATION:

Not available for non-UHF/RHF references. Only available for EOM/CI methods for which analytic
gradients are available.

CC_SYMMETRY

Controls the use of symmetry in coupled-cluster calculations

TYPE:

LOGICAL

DEFAULT:

TRUE

OPTIONS:

TRUE
Use the point group symmetry of the molecule
FALSE
Do not use point group symmetry (all states will be of $A$ symmetry).

RECOMMENDATION:

It is automatically turned off for any finite difference calculations, *e.g.*
second derivatives.

STATE_ANALYSIS

Activates excited state analyses using libwfa.

TYPE:

LOGICAL

DEFAULT:

FALSE (no excited state analyses)

OPTIONS:

TRUE, FALSE

RECOMMENDATION:

Set to TRUE if excited state analysis is required, but also if plots
of densities or orbitals are needed. For details see
Section 10.2.6.

G_TENSOR

Activates g-tensor calculation.

TYPE:

LOGICAL

DEFAULT:

FALSE

OPTIONS:

FALSE (or 0)
Don’t calculate g-tensor
TRUE (or 1)
Calculate g-tensor.

RECOMMENDATION:

None.

Note: g-Tensor calculations are only available for CCSD.

$molecule 0 1 C H 1 rCH H 1 rCH 2 aHCH rCH = 1.083 aHCH = 145. $end $rem JOBTYPE OPT METHOD EOM-CCSD BASIS cc-pVTZ SCF_GUESS CORE SCF_CONVERGENCE 9 EE_SINGLETS [0,0,0,1] EOM_NGUESS_SINGLES 2 CC_STATE_TO_OPT [4,1] EOM_DAVIDSON_CONVERGENCE 9 use tighter convergence for EOM amplitudes $end @@@ $molecule read $end $rem METHOD EOM-CCSD BASIS cc-pVTZ SCF_GUESS READ EE_SINGLETS [0,0,0,1] EOM_NGUESS_SINGLES 2 CC_EOM_PROP 1 calculate properties for EOM states CC_FULLRESPONSE 1 use fully relaxed properties $end

$molecule 0 3 C H 1 rch H 1 rch 2 ahch rch = 1.1167 ahch = 102.07 $end $rem METHOD eom-ccsd BASIS cc-pvtz SCF_GUESS core SCF_CONVERGENCE 9 SF_STATES [2,0,0,3] Get three 1^B2 and two 1^A1 SF states CC_EOM_PROP 1 CC_TRANS_PROP 1 CC_STATE_TO_OPT [4,1] First EOM state in the 4th irrep $end

$molecule 0 2 H C 1 CH CL 2 CCL 1 CCLH H 2 CH 3 CCLH 1 DIH CH = 1.096247 CCL = 2.158212 CCLH = 122.0 DIH = 180.0 $end $rem JOBTYPE OPT METHOD EOM-CCSD BASIS 6-31G* Basis Set SCF_GUESS SAD EOM_DAVIDSON_CONVERGENCE 9 EOM amplitude convergence CC_T_CONV 9 CCSD amplitudes convergence EE_STATES [0,0,0,1] CC_STATE_TO_OPT [4,1] EOM_NGUESS_SINGLES 2 GEOM_OPT_TOL_GRADIENT 2 GEOM_OPT_TOL_DISPLACEMENT 2 GEOM_OPT_TOL_ENERGY 2 $end @@@ $molecule read $end $rem METHOD EOM-CCSD BASIS 6-31G* Basis Set SCF_GUESS READ EE_STATES [0,0,0,1] EOM_NGUESS_SINGLES 2 CC_EOM_PROP 1 calculate one-electron properties CC_EOM_PROP_TE 1 and two-electron properties (S^2) $end @@@ $molecule read $end $rem METHOD EOM-CCSD BASIS 6-31G* Basis Set SCF_GUESS READ EE_STATES [0,0,0,1] EOM_NGUESS_SINGLES 2 CC_EOM_PROP 1 calculate one-electron properties CC_EOM_PROP_TE 1 and two-electron properties (S^2)CC_EXSTATES_PROP 1 CC_FULLRESPONSE 1 same as above, but do fully relaxed properties $end

$molecule 0 1 O C 1 1.4 H 2 1.0 1 120 H 2 1.0 1 120 3 180 $end $rem BASIS 6-31+G METHOD EOM-CCSD EE_STATES [0,3,0,1] CC_STATE_TO_OPT [2,3] CC_TRANS_PROP true $end

$molecule 0 1 H 0.774767 0.000000 0.458565 O 0.000000 0.000000 -0.114641 H -0.774767 0.000000 0.458565 $end $rem JOBTYPE opt METHOD eom-ccsd BASIS 6-311G IP_STATES [0,0,0,1] CC_STATE_TO_OPT [4,1] $end

$molecule 0 1 C 0.0000000000 0.0000000000 0.5721328608 O 0.0000000000 0.0000000000 -0.7102635035 H 0.9478180646 0.0000000000 1.1819748108 H -0.9478180646 0.0000000000 1.1819748108 $end $rem JOBTYPE opt METHOD eom-ccsd BASIS gen N_FROZEN_CORE 0 SCF_CONVERGENCE 9 CC_CONVERGENCE 9 EOM_DAVIDSON_CONVERGENCE 9 EA_STATES [0,0,0,2] CC_STATE_TO_OPT [4,1] XC_GRID 000250000974 COMPLEX_CCMAN 1 $end $complex_ccman CS_HF 1 CAP_TYPE 1 CAP_ETA 60 CAP_X 3850 CAP_Y 2950 CAP_Z 6100 $end $basis H 0 S 3 1.00 13.0100000 0.196850000E-01 1.96200000 0.137977000 0.444600000 0.478148000 S 1 1.00 0.122000000 1.00000000 P 1 1.00 0.727000000 1.00000000 S 1 1.00 0.297400000E-01 1.00000000 P 1 1.00 0.141000000 1.00000000 **** C 0 S 8 1.00 6665.00000 0.692000000E-03 1000.00000 0.532900000E-02 228.000000 0.270770000E-01 64.7100000 0.101718000 21.0600000 0.274740000 7.49500000 0.448564000 2.79700000 0.285074000 0.521500000 0.152040000E-01 S 8 1.00 6665.00000 -0.146000000E-03 1000.00000 -0.115400000E-02 228.000000 -0.572500000E-02 64.7100000 -0.233120000E-01 21.0600000 -0.639550000E-01 7.49500000 -0.149981000 2.79700000 -0.127262000 0.521500000 0.544529000 S 1 1.00 0.159600000 1.00000000 P 3 1.00 9.43900000 0.381090000E-01 2.00200000 0.209480000 0.545600000 0.508557000 P 1 1.00 0.151700000 1.00000000 D 1 1.00 0.550000000 1.00000000 S 1 1.00 0.469000000E-01 1.00000000 P 1 1.00 0.404100000E-01 1.00000000 D 1 1.00 0.151000000 1.00000000 S 1 1.00 0.234500000E-01 1.00000000 S 1 1.00 0.117250000E-01 1.00000000 S 1 1.00 0.058625000E-01 1.00000000 P 1 1.00 0.202050000E-01 1.00000000 P 1 1.00 0.101025000E-01 1.00000000 P 1 1.00 0.050512500E-01 1.00000000 **** O 0 S 8 1.00 11720.0000 0.710000000E-03 1759.00000 0.547000000E-02 400.800000 0.278370000E-01 113.700000 0.104800000 37.0300000 0.283062000 13.2700000 0.448719000 5.02500000 0.270952000 1.01300000 0.154580000E-01 S 8 1.00 11720.0000 -0.160000000E-03 1759.00000 -0.126300000E-02 400.800000 -0.626700000E-02 113.700000 -0.257160000E-01 37.0300000 -0.709240000E-01 13.2700000 -0.165411000 5.02500000 -0.116955000 1.01300000 0.557368000 S 1 1.00 0.302300000 1.00000000 P 3 1.00 17.7000000 0.430180000E-01 3.85400000 0.228913000 1.04600000 0.508728000 P 1 1.00 0.275300000 1.00000000 D 1 1.00 1.18500000 1.00000000 S 1 1.00 0.789600000E-01 1.00000000 P 1 1.00 0.685600000E-01 1.00000000 D 1 1.00 0.332000000 1.00000000 S 1 1.00 0.394800000E-01 1.00000000 S 1 1.00 0.197400000E-01 1.00000000 S 1 1.00 0.098700000E-01 1.00000000 P 1 1.00 0.342800000E-01 1.00000000 P 1 1.00 0.171400000E-01 1.00000000 P 1 1.00 0.085700000E-01 1.00000000 **** $end

$molecule 0 1 O H 1 0.959 H 1 0.959 2 104.654 $end $rem METHOD eom-ccsd BASIS aug-cc-pvtz EE_SINGLETS [1,0,0,0] 1A_1 state CC_TRANS_PROP 1 Compute transition properties CC_EOM_2PA 1 Calculate 2PA cross-sections using the fastest algorithm $end

$molecule 0 1 O H 1 0.959 H 1 0.959 2 104.654 $end $rem METHOD eom-ccsd BASIS aug-cc-pvdz EE_SINGLETS [2,0,0,0] Two A_1 states CC_TRANS_PROP 1 Calculate transition properties CC_EOM_2PA 1 Calculate 2PA cross-sections using the fastest algorithm $end $2pa n_2pa_points 11 omega_1 500000 5000 $end

$molecule 0 1 O H 1 0.959 H 1 0.959 2 104.654 $end $rem METHOD eom-ccsd BASIS aug-cc-pvtz EE_SINGLETS [2,0,0,0] Two A_1 states CC_STATE_TO_OPT [1,1] "Reference" state for transition properties is 1A_1 state CC_TRANS_PROP 1 Compute transition properties CC_EOM_2PA 1 Calculate 2PA cross-sections using the fastest algorithm $end

$molecule 0 1 C -0.0303943366 -0.3149506151 -0.0436827067 H -0.1031279784 -1.4353675705 -0.1647400816 O 1.0178175761 0.2350702146 0.2517598501 C -1.3252768442 0.1905302054 -0.4205132671 H -2.0767072171 0.1461814657 0.3842573052 $end $rem BASIS cc-pvdz METHOD eom-ccsd SYM_IGNORE true SF_STATES [2] CC_STATE_TO_OPT [1,1] THRESH 14 CALC_SOC 1 CC_TRANS_PROP 1 $end

$molecule 0 1 C -0.0303943366 -0.3149506151 -0.0436827067 H -0.1031279784 -1.4353675705 -0.1647400816 O 1.0178175761 0.2350702146 0.2517598501 C -1.3252768442 0.1905302054 -0.4205132671 H -2.0767072171 0.1461814657 0.3842573052 $end $rem BASIS cc-pvdz METHOD eom-ccsd SYM_IGNORE true EE_TRIPLETS [1] THRESH 14 CALC_SOC 1 CC_TRANS_PROP 1 $end

$molecule 0 3 N H N 1.0450 $end $rem METHOD = eom-ccsd BASIS = 6-31g SF_STATES = [1,2,0,0] CC_TRANS_PROP = true CALC_SOC = 3 ! legacy code CC_STATE_TO_OPT = [1,1] $end

$molecule +1 1 H 0.00000 0.00000 0.0 He 0.00000 0.00000 3.0 $end $rem JOBTYPE = FORCE METHOD = EOM-CCSD BASIS = cc-pVDZ INPUT_BOHR = true EE_TRIPLETS = [2] CC_EOM_PROP = true SYM_IGNORE = true Do not reorient molecule and turn off symmetry CALC_NAC = 2 Invoke Szalay NAC EOM_DAVIDSON_CONVERGENCE = 9 tight davidson convergence SCF_CONVERGENCE = 9 Hartree-Fock convergence threshold 1e-9 CC_CONVERGENCE = 9 $end @@@ $molecule read $end $rem JOBTYPE = FORCE METHOD = EOM-CCSD BASIS = cc-pVDZ INPUT_BOHR = true EE_STATES = [2] singlets SYM_IGNORE = true Do not reorient molecule and turn off symmetry CALC_NAC = 2 Invoke Szalay NAC EOM_DAVIDSON_CONVERGENCE = 9 tight davidson convergence SCF_CONVERGENCE = 9 Hartree-Fock convergence threshold 1e-9 CC_CONVERGENCE = 9 $end

$molecule 0 1 He $end $rem METHOD ccsd BASIS cc-pvdz CC_REF_PROP 1 CC_POL 2 CC_DIIS_SIZE 15 CC_FULLRESPONSE 1 $end