Work out the quadratic Zeeman effect for the ground-state hydrogen atom [⟨𝐱 | 0⟩= .(1 / √(πa0^3)) e^-r / a0] due to the usually neglected e^2 𝐀^2 / 2 me c^2 -term in the Hamiltonian taken to first order. Write the energy shift as Δ=-(1)/(2)χ𝐁^2 and obtain an expression for diamagnetic susceptibility, χ. The following definite integral may be useful: ∫0^∞ e^-α r r^n d r=(n !)/(α^n 1) | Numerade

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