Condensed states and their decay in a system of excited cesium atoms

Edward A. Manykin, M. I. Ozhovan, Pavel P. Poluektov +1 more

Edward A. Manykin, M. I. Ozhovan, Pavel P. Poluektov +1 more

Лебедев, V. E. Cherkovets, S.V. Yusim

Barbara M. Hoeling, Jeng-Rong Yeh, T. Takekoshi +1 more

The lifetime of the atomic cesium 5(2)D(5/2) state was measured with time-correlated single-photon counting spectroscopy. Ground-state cesium atoms were excited with a diode laser by use of an electric quadrupole transition. Analysis of the exponential decay of the cascade photons from the 6(2)P(3/2) state yields a 5(2)D(5/2) lifetime of 1225(12) ns.

Edward A. Manykin, Michael I. Ojovan, Pavel P. Poluektov

Rydberg matter is a condensed excited state made of highly excited atoms. State of art of research in the field of Rydberg matter is briefly reviewed. Special attention is focused on the contribution of Russian and Swedish scientists' groups to the analysis of this problem. Most attention is concentrated on physical principles of pseudopotential method and density functional theory used to describe the Rydberg matter. The description of Rydberg matter as an excited state becomes viable after the formal replacement of excited atoms by ground state pseudoatoms. This procedure has been used to find parameters of Rydberg matter made of highly excited cesium atoms. Theoretical estimations conform to experimental data available.

S. J. J. M. F. Kokkelmans, B. Verhaar, Kurt Gibble

We analyze all of the cold-collision data for Cs, consisting of atomic fountain frequency shifts and elastic scattering rates, to determine phase parameters that completely characterize cold collisions between two ground-state cesium atoms. We show that the fast decays of spin-polarized gas samples in two recent attempts to reach Bose-Einstein condensation in cesium are due to potential and Feshbach resonances which enhance the depolarizing atom-atom collisions. We discuss the prospects for realizing Bose-Einstein condensation in ${}^{133}\mathrm{Cs}$ and in ${}^{135}\mathrm{Cs}$.