Consider the delta well potential energy:
Although not completely realistic, this potential energy is often a convenient approximation to a very strong, very narrow attractive potential energy well. It has only one allowed bound-state wave function, and because the top of the well is defined as U=0, the corresponding bound-state energy is negative. Call its value — E0.
(a) Applying the usual arguments and required continuity conditions (need it be smooth?), show that the wave function is given by
(b) Sketch ψ(x) and U(x) on the same diagram. Does this wave function exhibit the expected behavior in the classically forbidden region?
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