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Principles of Quantum Mechanics by Dr Singh Tyagi

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Chapter 16

Time-dependent Perturbation Theory

16.1  INTRODUCTION

In the previous Chapter, we discussed the effects of small time-independent perturbation Ĥ′(r) on the energy eigenvalues img and eigenstates equation of the unperturbed Hamiltonian Ĥ0. In Chapter 7 we learnt that the stationary eigenstates equation of a time-independent Hamiltonian Ĥ0 form a complete orthonormal set such that any state function ψ(r) in that space may be expressed as a linear combination ...

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