Figure 2. The function Ψ(r,ω) in (4.6) for r=3/5, showing it to be essentially constant =0 for ω<0.4

From

Can a Charge Configuration with Extreme Excess Charge be Stable?

Arne Bergstrom

International Journal of Physics. 2015, 3(4), 150-154 doi:10.12691/ijp-3-4-2