What is "excursion" of a potential well? I think it means maximum depth of the well, but I've never heard this term before and I might be wrong. I don't have much of a quantum mechanics background. Details: I'm reading and implementing "Solution of the Schrodinger Equation by a Spectral Method" by Feit et al. They refer to delta_V as the "maximum excursion" of the potential. I interpret this to mean "minimum" of the potential, but my interpretation does not match up with the numbers they provide at the end. EDIT: If someone could just give me the relation between the maximum depth of a potential well and the bandwidth of the energy spectrum that would solve it for me. EDIT2: Time independent Hamiltonian.