## Interaction energy among three helium atoms |

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1-s atoms 1-s functions 1-s orbitals aacb acba assumed a's atomic orbitals atomic units bare-nuclear-field bcaa bcba bcca bcba bcca ccaa BITAL Bohr Radii C. C. J. Roothaan caac cacc CATHOLIC UNIVERSITY central coefficient Chem computed CONSTRUCTING THE G Cowan and Roothaan determined effect of non-additivity eigenvalues electron equation solver evaluated G matrix gave the LCAO given by Hirschfelder given in Table Hartree Units internuclear separation ionic crystals JJJJJJJJJ Jprqs LCAO MO's LCAO SCF method LCAO's linear combinations linear configuration Macek MATRIX Each element molecular orbitals molecular system Mulliken nuclear field nuclear repulsion One-center integrals orbital energies overlap integral partition function Phys potential energy Roothaan's method secular equation self-consistent field Slater-type spherical coordinates spin symmetry tegrals teraction three helium atoms three MO's Three-center integrals tion total and interaction total energy two-center type undetermined coefficients UNIVERSITY OF AMERICA Vanderslice various values Virginia Griffing wave function Wehner