Positronic complexes with unnatural parity

Abstract

The structure of the unnatural parity states of PsH, LiPs, NaPs and KPs are investigated with the configuration interaction and stochastic variational methods. The binding energies (in hartree) are found to be 8.17x10-4, 4.42x10-4, 15.14x10-4 and 21.80x10-4 respectively. These states are constructed by first coupling the two electrons into a configuration which is predominantly 3Pe, and then adding a p-wave positron. All the active particles are in states in which the relative angular momentum between any pair of particles is at least L = 1. The LiPs state is Borromean since there are no 3-body bound subsystems (of the correct symmetry) of the (Li+, e-, e-, e+) particles that make up the system. The dominant decay mode of these states will be radiative decay into a configuration that autoionizes or undergoes positron annihilation.

10 pages RevTeX, 6 figures, in press Phys.Rev.A

References in corpus (9)

• Second bound state of the positronium molecule and biexcitons
• High-accuracy relativistic many-body calculations of van der Waals coefficients C_6 for alkaline-earth atoms
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Cited by in corpus (3)

• Global-Vector Representation of the Angular Motion of Few-Particle Systems II
• The domain of stability of unnatural parity states of three unit charges
• Few-boson system with a single impurity: Universal bound states tied to Efimov trimers