19.01.2015 Views

MOLPRO

MOLPRO

MOLPRO

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

30 LOCAL METHODS FOR EXCITED STATES 225<br />

30.2 Options for EOM<br />

see also section 25.1.<br />

In the case of LT-DF-LCC2/ADC(2) multistate calculations are possible, and it is recommended<br />

to calculate more states as needed.<br />

The parameters on the EOM card:<br />

EOM,-n.1, key1=value1, key2=value2,. . .<br />

where n.1 is the last state of interest, e.g., with EOM,-5.1 the four lowest excited states will be<br />

calculated. The following keywords key are possible:<br />

SINGLET=ising<br />

TRIPLET=itrip<br />

If set to 1, singlet states will be calculated (default).<br />

If set to 1, triplet states will be calculated (not implemented for ADC(2)).<br />

EXFILE=record.ifil Record for converged CIS eigenvectors (default 6100.2).<br />

SAVE=record.ifil<br />

SAVET=record.ifil<br />

START=record.ifil<br />

STARTT=record.ifil<br />

NSRCH4ST=nst<br />

THRLCH=thrlch<br />

THRLCD=thrlcd<br />

ADC2=adc2<br />

Record for save of restart information.<br />

Record for restart information for triplet states (if calculated together<br />

with singlet states).<br />

Record for restart of previous calculation.<br />

Record for restart of previous calculation (if calculated together with<br />

singlet states).<br />

In the first nst iterations in the Davidson diagonalisation the excited<br />

state domains are determined for each basis vector in the Davidson<br />

subspace (”search for states”) (default 7).<br />

threshold for the Davidson procedure. If smaller than zero, the Davidson<br />

procedure is skipped and DIIS is started directly instead (possible<br />

only for restart, SAVE and START have to be identical).<br />

threshold for DIIS.<br />

if = 1, do ADC(2) calculation instead of CC2. if = 2, use LT-DF-<br />

LMP2 for the ground state.<br />

Default local approximations are defined according to procedure described in Ref. [3] (Laplace<br />

domains).<br />

INTFRAC=fracint<br />

INTEXC=excint<br />

REALFRAC=fracreal<br />

FULLFRAC=fracfull<br />

Rough criterion for specifying eom-domains from laplace-transformed<br />

integrals (default 0.8).<br />

Criterion for specifying important orbitals from laplace-transformed<br />

integrals (default 0.999).<br />

Exact criterion for specifying eom-domains from laplace-transformed<br />

integrals (default 0.98).<br />

Check for all orbital domains (complete sum over all orbitals) (default<br />

0.95).<br />

To switch to local aproximations calculated according to Ref. [6] (Boughton-Pulay procedure<br />

for excited states), set INTFRAC to zero.<br />

Occupied orbital pair lists are calculated from important orbitals (Refs. [1,5]).

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!