[QUE/QM-24004]

A particle in the ground state of an infinite square well is perturbed by a transient effect described by the Hamiltonian (in coordinate representation) \begin{equation*} H (x; t) = A_0 \sin\big(\frac{2\pi x}{L}\big) \delta(t) \end{equation*} where \(A_0\) is a constant with the dimensions of action. What is the probability that after this jolt an energy measurement will find the system in the first excited state?

Source{Daniel F. Styer}