Long-range Rydberg-Rydberg interactions and molecular resonances
Physics Department, University of Connecticut, 2152 Hillside Rd., Storrs, CT, 06269-3046, USA
Corresponding author: a email@example.com
Revised: 28 April 2006
Published online: 21 June 2006
We present a detailed theoretical treatment to describe the lineshape of molecular resonances in a cold dense gas of rubidium Rydberg atoms. Molecular potentials in Hund's case (c) are calculated by diagonalization of an interaction matrix. We show how the strong ℓ-mixing due to long-range Rydberg-Rydberg interactions can lead to resonances in excitation spectra. Such resonances were first reported in [S.M. Farooqi et al., Phys. Rev. Lett. 91, 183002 (2003)], where single UV photon excitations from the 5s ground state occurred at energies corresponding to normally forbidden transitions or very far detuned from the atomic energies. Here, we focus our attention on resonances at energies corresponding to excited atom pairs (n - 1)p3/2+(n + 1)p3/2. Very good agreement between the theoretical and experimental lineshapes is found.
PACS: 32.80.Rm – Multiphoton ionization and excitation to highly excited states / 32.80.Pj – Optical cooling of atoms; trapping / 34.20.Cj – Interatomic potentials and forces
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2006