Physics · Quantum Mechanics
The unperturbed energies (in eV) of a three-level system are ε 0 = 2, ε 1 = 4, and ε 2 = 6. The matrix elements of a perturbation V (in eV) between the levels are V 10 = 4, V 20 = 6, and V 12 = 10. The second-order correction to the ground state energy (in eV) in the presence of perturbation V is:
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