The Scattering Operator in Quantum Mechanics, Vol. 2: The Scattering Operator Formalism and Other Formalism (Classic Reprint) - Hardcover

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Excerpt from The Scattering Operator in Quantum Mechanics, Vol. 2: The Scattering Operator Formalism and Other Formalism

This statement is essentially the adiabatic theorem for the continuous spectrum which can be worded as follows: When a perturbation is switched on infinitely slowly, a superposition of eigenstates of the unperturbed Hamiltonian in the infinite past goes over into the identical superposition of corresponding eigenstates of the total Hamiltonian at finite times.

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