The electronic resonances in expanding non-neutral ultracold plasma

We present a calculation of the natural oscillation spectrum of a bounded non-neutral ultra-cold plasma. The frequencies of these oscillations are recorded in experiments as absorption resonances of high-frequency electric field. Dependence of the frequency of these resonances on the charge imbalance and on the expansion time is obtained. Good agreement with experiment is note

Laser cooling of 7Li atoms in a magneto-optical trap

A setup for laser cooling and confining of 7Li atoms in a magneto-optical trap has been built. The possibility of cooling and trapping of 7Li atoms in a wide range of frequency detuning of the cooling laser has been proved experimentally. Independent information on the density and number of ultracold 7Li atoms on various ground-state sublevels, as well as on the temperature of the atoms, has been obtained with the use of a probing tunable laser. This information is important for preparing an ultracold plasma and Rydberg matter

Bose condensation in dilute gas of hard spheres with attraction

Critical temperature is calculated for Bose-Einstein condensation of hard spheres with attraction using the path-integral Monte Carlo (PIMC) method and finite-size scaling. It is demonstrated that the scattering length is not the only parameter which the critical temperature depends on. It is also shown that Bose condensation may be observed in the case of negative scattering length