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27 THE MRCC PROGRAM OF M. KALLAY (MRCC) 197<br />

Table 11: Options for MRCC<br />

Option Alias Default value a Meaning<br />

METHOD CALC CC(n) Computational method. See Table 12.<br />

EXCITATION LEVEL -1 Excitation level in cluster operator<br />

RESTART CC RESTART 0 Restart option. If 1, restart with previous amplitudes.<br />

DIRECTORY DIR ’ ’ Subdirectory in which MRCC runs<br />

(necessary for restart jobs)<br />

EOM NSING NSING -1 Number of excited singlet states in closed-shell case<br />

EOM NTRIP NTRIP 0 Number of excited triplet states in closed-shell case<br />

EOM NSTATES NDOUB -1 Number of states in open shell case.<br />

SYMM SYMMETRY -1 Symmetry of excited states<br />

DENSITY IDENS 0 Parameter for density calculation<br />

HF 1 1 for canonical Hartree-Fock orbitals, 0 otherwise<br />

SPATIAL 1 0 for spin-restricted orbitals, 1 for spin-unrestricted orbitals<br />

NACTO 0 Number of active occupied orbitals<br />

NACTV 0 Number of active virtual orbitals<br />

SACC 0 Spin-adapted coupled cluster<br />

DBOC 0 Diagonal BO correction<br />

MEMORY -1 Memory<br />

TOL ENERGY -1.0 Energy convergence threshold<br />

FREQ 0.0 Frequency for dynamic polarizabilities<br />

FILE fort Name for MRCC fortran files<br />

CONVER ICONV 0 See mrcc manual<br />

CS 1 See mrcc manual<br />

DIAG 0 See mrcc manual<br />

MAXEX 0 See mrcc manual<br />

a) -1 means default value taken from <strong>MOLPRO</strong>

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