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31 EXPLICITLY CORRELATED METHODS 235<br />

GEM NUMBER Number of Gaussian geminal functions (default 6).<br />

GEM CENTRE<br />

GEM RATIO<br />

GEM BETA<br />

GEM OMEGA<br />

Centre of even tempered geminal exponents, if GEM BASIS=EVEN<br />

(default 1.0).<br />

Ratio of even tempered geminal exponents, if GEM BASIS=EVEN<br />

(default 3.0).<br />

Exponent for Slater-type frozen geminal, or parameter for weight function<br />

in other frozen geminal models (default 1.0 a −1<br />

0<br />

). It is possible<br />

to specify extra exponents for core-core and core-valence correlation.<br />

If two values are given (in square brackets), the first is used for valence<br />

pairs, the second for core-core (cc) and core-valence (cv) pairs.<br />

If three values are given, the first is used for vv, the second for cv, and<br />

the third for cc correlation.<br />

Exponent for weighting function (default -1, which means a value<br />

derived from GEM BETA).<br />

GEM MOM Exponent for r in omega fitting (default 0).<br />

GEM M Exponent for r in weighting function (default 0).<br />

GEM MAXIT Max. number of iterations in geminal optimization (default 200).<br />

GEM PRINT Print parameter for geminal optimization (default 0).<br />

GEM DEBUG Debug option for geminal optimization (default 0).<br />

GEM ACC Convergence threshold for geminal line search (default 0.001).<br />

GEM FAC Scaling factor for exponents in geminal optimization (default 1.0).<br />

GEM METHOD<br />

Geminal optimization method (augmented Hessian (AH) or Newton-<br />

Raphson (NR), default AH).<br />

GEM TRUST Trust ratio in AH geminal optimization (default 0.4).<br />

GEM SHIFT Hessian shift in AH geminal optimization (default 0).<br />

GEM NUMERICAL Flags numerical integration in geminal optimization (default 0).<br />

GEM PLOT<br />

GEM OPT FULL<br />

GEM BETA OPT<br />

SIM MULTGEM<br />

PRINT=ipri<br />

Geminal plot file (default blank).<br />

If nonzero (default), fit each geminal independently to Gaussians (if<br />

several exponents are used). If zero, the first exponent is fitted, unless<br />

GEM BETA OPT is specified.<br />

Exponent used to fit the Gaussian expansion.<br />

Only for calculation with multiple exponents: if nonzero, loop externally<br />

over integral program for different exponents. This is implied<br />

automatically if each geminal is fitted independently. If the same<br />

Gaussian exponents are used for each Slater exponent, SIM MULTGEM=0<br />

can be used (default). In this case the integral program handles the<br />

general contractions (slightly faster).<br />

Select output level:<br />

ipri=0<br />

ipri=1<br />

ipri=2<br />

Standard output<br />

Standard output plus more detailed information<br />

about integral evaluations.<br />

Debugging output<br />

THRBINV<br />

THRF12<br />

Threshold below which non-physical eigenvalues are projected from<br />

approximate B matrices<br />

Threshold for integral screening contribution.

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