Figure 15: Pick-off annihilation rate constant of Ps, localized in a bubble of when (brown curve). For small ( ) the calculated values of are equal to . The red line shows the pick-off annihilation rate constant, calculated according to the Tao-Eldrup formula. The dashed line is the calculation according to the finite potential well model (for comparison we adopted that the depth of the well is eV and its radius is ; in this case the minimal radius of the well when there appears an energy level for Ps is ).