title: Long-range molecular resonances in a cold Rydberg gas.
abstract: We present evidence for molecular resonances in a cold dense gas of rubidium Rydberg atoms. Single UV photon excitation from the 5s ground state to np Rydberg states (n=50-90) reveals resonances at energies corresponding to excited atom pairs (n-1)d+ns. We attribute these normally forbidden transitions to avoided crossings between the long-range molecular potentials of two Rydberg atoms. These strong van der Waals interactions result in avoided crossings at extremely long range, e.g., approximately 58 000 times the Bohr radius (a(0)) for n=70.
authors: Department of Physics, U-3046, University of Connecticut, Storrs, CT 06269, USA.
authors: S M
authors: SM
authors: Farooqi
authors: D
authors: D
authors: Tong
authors: S
authors: S
authors: Krishnan
authors: J
authors: J
authors: Stanojevic
authors: Y P
authors: YP
authors: Zhang
authors: J R
authors: JR
authors: Ensher
authors: A S
authors: AS
authors: Estrin
authors: C
authors: C
authors: Boisseau
authors: R
authors: R
authors: Côté
authors: E E
authors: EE
authors: Eyler
authors: P L
authors: PL
authors: Gould