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33 SYMMETRY-ADAPTED INTERMOLECULAR PERTURBATION THEORY 255<br />

33.8 Options<br />

SAPT LEVEL Set to 1 for first-order terms (E (1)<br />

pol<br />

and E(1)<br />

exch<br />

), to 2 for additional second<br />

order (exchange-)induction terms (E (2)<br />

ind<br />

and E(2)<br />

exch−ind<br />

) and 3 for all<br />

first- and second-order terms (including then also E (2)<br />

disp<br />

and E(2)<br />

exch−disp )<br />

(default 3)<br />

SAPT FITLEVEL<br />

SAPT ICPKS<br />

SAPT CPKSTHR<br />

SAPT CPKMAXIT<br />

SAPT FROZENA<br />

Level of density fitting approximations in SAPT which can have values<br />

0 to 3 (default 0)<br />

Switch between iterative (=1) and non-iterative (=0) solution of coupledperturbed<br />

Kohn-Sham equations (default 0)<br />

Threshold for density matrix convergency in the coupled-perturbed<br />

Kohn-Sham program (default 1.d-6).<br />

Maximum number of iterations in the coupled-perturbed Kohn-Sham<br />

program (default 50).<br />

Number of frozen electrons in the response calculations for monomer<br />

A (default 0)<br />

The following parameters are of importance if SAPT_FITLEVEL>0:<br />

SAPT NFRQ DISP Number of frequencies for the Casimir-Polder integration (default 12)<br />

SAPT NORM DISP<br />

SAPT DISP N4<br />

THR XCKERN<br />

Norm for the density fitting which can be either COULOMB or NATURAL<br />

(default COULOMB)<br />

Can speedup the calculation of the dispersion energy by N 4 scaling<br />

(default 1)<br />

Density threshold for the xc kernel matrix elements (default 1.d-8)<br />

FIT XCKERN Fit both sides of the xc kernel (default 0)<br />

SAPT DISK<br />

COMPRESS THR<br />

UNCOUPLED<br />

THRAO<br />

THRMO<br />

THROV<br />

THRPROD<br />

THRSW<br />

C6<br />

XCKERN NBLOCK<br />

If 0 write all dimer amplitudes to file, if 1 write 3-index response<br />

propagators to file and if 2 write 3-index response propagators compressed<br />

to file. The latter two variants save disk space but need more<br />

CPU time to compute E (2)<br />

exch−disp<br />

(default 0)<br />

If SAPT DISK=2 this value determines the compression cutoff (default<br />

1d-12)<br />

If SAPT DISK>0 calculate also uncoupled (exchange-)dispersion energies<br />

(default false)<br />

Threshold for AO 3-index integrals (default 1.d-12)<br />

Threshold for MO 3-index integrals (default 1.d-8)<br />

Threshold for AO 2-index integrals (default 1.d-10)<br />

Product threshold for first half transformation (default 1.d-8)<br />

Threshold for Schwarz screening (default 1.d-5)<br />

Calculate dispersion coefficients for the two monomers (Note that the<br />

full dimer basis set is used in each case and that a closer distance of<br />

the monomers can perturb the result).<br />

number of grid points treated together as a block for (aux|f xc |occ×virt)<br />

integrals (default 128)

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