The use of scaled STO basis sets in SCF calculations on H? and Li+

1987 ◽  
Vol 83 (1) ◽  
pp. 211 ◽  
Author(s):  
Graham Doggett
Keyword(s):  
Basis Sets ◽  
Scf Calculations

A simplified core pseudopotential model for use in valence-electron molecular SCF calculations

1978 ◽  
Vol 31 (12) ◽  
pp. 2571 ◽  
Author(s):  
E Nagy-Felsobuki ◽  
JB Peel
Keyword(s):  
Valence Electron ◽  
Ground States ◽  
Model Potential ◽  
Basis Sets ◽  
Bond Lengths ◽  
The Core ◽  
Orbital Energies ◽  
Scf Calculations

A molecular valence-electron-only model potential (VEOMP) method is proposed in which the core-valence interpenetration term is replaced by an exponential screening function and the core-valence orthogonality is represented by a pseudopotential term in which the required parametrization is minimized without compromising the effectiveness of the method. This model has been incorporated in the GAUSSIAN 70 programs, and sample calculations, using the STO-3G and STO-6G minimum basis sets, are reported for the orbital energies and equilibrium bond lengths of the ground states of N2, PN and P2.

Effect of basis sets on ab initio SCF calculations of molecular hardness

1994 ◽  
Vol 306 (1) ◽  
pp. 87-90 ◽  
Author(s):  
S. Nath ◽  
A.B. Sannigrahi ◽  
P.K. Chattaraj
Keyword(s):  
Ab Initio ◽  
Basis Sets ◽  
Scf Calculations

A comparative theoretical study of the electronic structure of some nickel(II) azides, thiocyanates, and isothiocyanates

1998 ◽  
Vol 76 (7) ◽  
pp. 1006-1014 ◽  
Author(s):  
R H Abu-Eittah ◽  
M El-Esawy ◽  
N Ghoneim ◽  
A T Aly
Keyword(s):  
Electronic Structure ◽  
Electronic Structures ◽  
Theoretical Study ◽  
Molecular Orbitals ◽  
Basis Sets ◽  
Theoretical Treatment ◽  
Double Zeta ◽  
Experimental Values ◽  
Scf Calculations ◽  
Split Valence

The electronic structure, conformation, and molecular orbitals of some nickel(II) azides, thiocyanates, and isothiocyanates have been studied. Three different basis sets: split valence (SV), split valence with six d-Gaussians (SV6D), and double zeta (DZ) sets, were used to find the best ground state for nickel. It has been found that the combination, DZ-3F, gives results closest to the experimental values. The electronic structures of the nickel azides studied were completely different from those of the nickel thiocyanates. On the other hand, the electronic structures of the nickel thiocyanates studied were highly comparable to those of the corresponding nickel isothiocyanates. Molecular orbitals were computed for the complexes studied and the types of electronic transitions expected were identified and discussed.Key words: Ni(II) azides, thiocyanates, and isothiocyanates: ab initio SCF calculations; MO calculations on some Ni(II) complexes; theoretical treatment of some Ni(II) ions and salts; geometry and energetics of some nickel(II) azides, thiocyanates, and isothiocyanates.

The effect of p, d, and f Gaussian polarization functions on the computed one-electron properties of AHn oxygen and sulfur hydrides

1978 ◽  
Vol 56 (4) ◽  
pp. 543-551 ◽  
Author(s):  
Raymond Poirier ◽  
Roy Kari
Keyword(s):  
Basis Sets ◽  
Gaussian Type ◽  
Field Gradients ◽  
Isoelectronic Series ◽  
Monotonic Convergence ◽  
Polarization Functions ◽  
Scf Calculations ◽  
Made In ◽  
Lcao Mo

A series of LCAO-MO-SCF calculations, using various basis sets of Gaussian-type functions, has been made in order to study the effects of p, d, and f polarization functions on calculated one-electron properties for a 10-electron isoelectronic series of oxygen hydrides and for an 18-electron series of sulfur hydrides. Conclusions from these results suggest that several one-electron properties have a predictable, although not monotonic convergence pattern. Except for calculated field gradients, f GPF's have only a small effect on the calculated values.

Development of new auxiliary basis functions of the Karlsruhe segmented contracted basis sets including diffuse basis functions (def2-SVPD, def2-TZVPPD, and def2-QVPPD) for RI-MP2 and RI-CC calculations

2015 ◽  
Vol 17 (2) ◽  
pp. 1010-1017 ◽  
Author(s):  
Arnim Hellweg ◽  
Dmitrij Rappoport
Keyword(s):  
Basis Functions ◽  
Basis Sets ◽  
Scf Calculations

Optimized auxiliary basis sets RI-post-SCF calculations are reported for the moderately diffuse def2-SVPD, def2-TZVPPD, and def2-QZVPPD basis sets.

Matrix Dirac—Fock—Breit SCF calculations on heavy atoms using geometric basis sets of Gaussian functions

1992 ◽  
Vol 188 (1-2) ◽  
pp. 145-148 ◽  
Author(s):  
Yasuyuki Ishikawa ◽  
Gulzari L. Malli ◽  
A. Jim Stacey
Keyword(s):  
Basis Sets ◽  
Gaussian Functions ◽  
Heavy Atoms ◽  
Scf Calculations

Geometries of the ground and first excited triplet states of thioformaldehyde

1981 ◽  
Vol 59 (22) ◽  
pp. 3200-3203 ◽  
Author(s):  
John D. Goddard
Keyword(s):  
Ground State ◽  
Reasonable Agreement ◽  
Basis Sets ◽  
Triplet States ◽  
Gaussian Basis Sets ◽  
Excited Triplet ◽  
Polarization Functions ◽  
Scf Calculations ◽  
Split Valence ◽  
Excited Triplet States

The geometries of the S0 and T1 states of thioformaldehyde are determined by ab initio SCF calculations with Gaussian basis sets ranging from minimal to double ζ plus both diffuse and polarization functions. The ground state geometries are all in reasonable agreement with experiment but for the n → π* triplet state split valence or double ζ basis sets yield unreasonably long CS bond distances.

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