Ls. Costa et Jjs. Neto, A wave function expansion for the study of tetra-atomic molecules in hyperspherical coordinate systems, MOLEC PHYS, 97(6), 1999, pp. 725-730
In this work, we focus on the tetra-atomic molecule problem in hyperspheric
al coordinates. In particular, we explore the system of hyperspherical coor
dinates as used, for example, by Ohrn and Linderberg (1983, Molec. Phys., 4
9, 53). We consider a wave function expansion which facilitates the analyti
c integration of the kinetic energy operator for the nine degrees of freedo
m.