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Approximate methods III: Time-dependent perturbation theory
4.1
Formalism
4.1.1
Perturbation which is switched on slowly
4.1.2
Sudden perturbation
4.2
Oscillatory perturbation and Fermi’s golden rule
4.3
Emission and absorption of radiation
4.3.1
Einstein’s
A
and
B
coefficients
4.4
Radiative decay of
2
p
state of hydrogen
4.5
Finite width of excited state
4.6
Selection rules
4.7
Heisenberg vs Schrödinger pictures
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