Abstract
The pure long-range state of an alkali-metal dimer is observed in using photoassociative spectroscopy of ultracold atoms. High-resolution spectra for vibrational levels are recorded by resonance-enhanced two-photon ionization. Strong rotation-hyperfine couplings are observed. Major molecular constants and a hyperfine structure analysis are presented. This state is useful as an ungerade Franck-Condon “window” at large internuclear distance for studies of highly excited long-range interactions.
- Received 2 October 1997
DOI:https://doi.org/10.1103/PhysRevA.57.4600
©1998 American Physical Society