Figure 2

Dephasing rate effects. (a) Dependence of the relaxation rate \(1/T_{2}\) on the temperature and number density in the cell. Heating increases the dephasing rate due to increased wall and spin exchange collisions through the relative velocity and number density of Cs atoms (described in the text). The number density n at every temperature is determined from data in Ref. [19]. (b) Dependence of the relaxation rate \(1/T_{2}^{*}\) on magnetic field gradient. The added gradient effectively dephases the system at a faster rate \((T_{2}^{*})^{-1}\). This was done at \(T=140^{\circ}\text{ C}\). The solid lines correspond to linear fits, the error bars are inside the markers