A variational approach to fopim

✍ Scribed by C.F. Lebeda; D.M. Schrader

• Publisher: Elsevier Science
• Year: 1968
• Tongue: English
• Weight: 428 KB
• Volume: 2
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(68)80034-x

✦ Synopsis

FOPI% (first order perturbation iteration method) is modified so that spin-factorable systems with unknown eigenfunctions can be treated (previous applications of FOPIM have been limited to systems xsitk eigenfunctions already known to all orders). The modification consists of [a) expressing rhe first order equation in terms of the full Hamiltonian rather than its zero& and first order parts and (b) aoprosimating successive first order wave functions variationally. Two Nerations are performed ior two different initial zeroth-order functions for the ground states of each of the systems H', He, and Li-using minimal espansions for the three successive first order functions.