Simple and accurate variational wavefunctions for two-electron ions

K.V. RODRIGUEZ, G. GASANEO AND D.M. MITNIK

Freiburg, Alemania

Conferencia; XXV International Conference on Photonic, Electronic and Atomic Collisions; 2007

ICPEAC

In this report we introduce a method to generate accurate but simple wave functions for two-electron ions. The functions are written in terms of exponential and power series, having accuracies and Hylleraas-like forms similar to those currently used in collisional problems but with the correct coalescence cusp conditions. The accuracy of the calculated energies is about 1.410-4 a.u. We also present approximate analytic expressions for the wave function and energies which are valid for a wide range of two-electron ions in the isoelectronic sequence with Z starting from Z=1.