Variational methods, multiprecision and nonrelativistic energies
V. I. Korobov
Abstract
It is known that the variational methods are the most powerful tool for studying the Coulomb three-body bound state problem. However, they often suffer from loss of stability when the number of basis functions increases. This problem can be cured by applying the multiprecision package designed by D.H. Bailey. We consider the variational basis functions of the type exp(-an r1 - bn r2 - gn r12) with complex exponents. The method yields the best available energies for the ground states of the helium atom and the positive hydrogen ion as well as many other known atomic and molecular systems.
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