Abstract
An experimental study of the previously unobserved and controversial states has been conducted using a combination of infrared laser and storage ring experiments. This first application of photodetachment spectroscopy to the study of low-lying resonances in atomic negative ions has resulted in the observation of a narrow resonance structure, lying only 8.0(3) meV above the first detachment threshold of . The storage ring experiments suggest that all fine structure levels of the configuration are unbound, thereby eliminating possibly the only serious candidate for a stable atomic negative ion with opposite parity bound states.
- Received 23 June 1997
DOI:https://doi.org/10.1103/PhysRevLett.80.684
©1998 American Physical Society