Abstract
A new, hitherto unknown bound state of the positronium molecule, with orbital angular momentum and negative parity, is reported. This state is stable against autodissociation even if the masses of the positive and negative charges are not equal. The existence of a similar state in two dimensions has also been investigated. The fact that the biexcitons have a second bound state may aid in the better understanding of their binding mechanism.
- Received 2 October 1997
DOI:https://doi.org/10.1103/PhysRevLett.80.1876
©1998 American Physical Society