Question: (a) Use a program like Mathematica to plot the phase boundary (8.11.29) in the nT plane, for the ionization catastrophe, and also the phase boundary
(a) Use a program like Mathematica to plot the phase boundary (8.11.29) in the n–T plane, for the ionization catastrophe, and also the phase boundary (8.11.27), for exciton radius a = 50 Å, exciton binding energy Δ = 10 meV, ϵ/ϵ0 = 10, and effective electron and hole masses both one-tenth the vacuum electron mass.
(b) Plot the same two curves for the case of hydrogen.

2 = (a ekBT) n = aEkBT Ry/kBT no (8.11.29)
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