The diffusion Monte Carlo technique is used to calculate and analyze the excitation spectrum of He atoms bound to a cluster of He atoms, by using a previously determined optimum filling of single-fermion orbits with well defined orbital angular momentum L, spin S and parity quantum numbers. The study concentrates on the energies and shapes of the three kinds of states for which the fermionic pa...

The Kellner wavefunction for a helium-like ion is the Hartree–Fock solution wherein the orbital is a Slater-type function with the variationally optimal exponent Z 5/16. The Wigner intracule W(u, v) of a system gives the joint quasiprobability of finding two electrons whose position space and momentum space separations are r1 r2 u and p1 p2 v, respectively. In this article, we extend Wigner int...

purpose : to report a patient with orbital pseudotumor masquerading as orbital cellulitis case report : a 42-year-old woman was referred to orbit and oculoplastic clinic with 6 days history of left orbital pain, proptosis, lid edema and fever. clinical finding included severe lid edema, chemosis, conjunctival injection and severe restriction in extraocular motility. she was diagnosed as orbital...

Voting (or rank aggregation) is a general method for aggregating the preferences of multiple agents. One important voting rule is the Slater rule. It selects a ranking of the alternatives (or candidates) to minimize the number of pairs of candidates such that the ranking disagrees with the pairwise majority vote on these two candidates. The use of the Slater rule has been hindered by a lack of ...

We have used computer algebra CA to tabulate closed expressions for over lap integrals of Slater orbitals with principal quantum numbers to con taining symbolic molecular parameters Also we have constructed precise closed expressions for a range of overlap integrals de ned by higher quantum numbers and numerical bond lengths and or screening constants Numerical values obtained from both sets of...

Only part of the correlation energy can be obtained from the wave function when expanded as a finite and linear combination of Slater determinants. For the remaining part, it was proposed by several authors to use density-functional theory. Thus, various methods coupling wave functions with density functionals were investigated in the past. In the present a class of such methods was developed, ...