Collision cross sections and rate constants between two ground-state oxygen molecules are investigated theoretically at translational energies below ;1 K and in zero magnetic field. We present calculations for elastic and spin-changing inelastic collision rates for different isotopic combinations of oxygen atoms as a prelude to understanding their collisional stability in ultracold magnetic tra...

Collision cross sections and rate constants between two groundstate oxygen molecules are investigated theoretically at translational energies below ∼ 1K and in zero magnetic field. We present calculations for elastic and spinchanging inelastic collision rates for different isotopic combinations of oxygen atoms as a prelude to understanding their collisional stability in ultracold magnetic traps...

Using the analogy between heat and mass transfer processes, the recently developed entransy theory is extended in this paper to tackle the coupled heat and mass transfer processes so as to analyze and optimize the performance of evaporative cooling systems. We first introduce a few new concepts including the moisture entransy, moisture entransy dissipation, and the thermal resistance in terms o...

We demonstrate a way to circumvent the interruption of evaporative cooling observed at high bias field for 87 Rb atoms trapped in the (F = 2, m = +2) ground state. Our scheme uses a 3-frequencies-RF-knife achieved by mixing two RF frequencies. This compensates part of the non linearity of the Zee-man effect, allowing us to achieve BEC where standard 1-frequency-RF-knife evaporation method did n...