Lippmann-Schwinger type equation

We now use the Lippmann-Schwinger equation to explore the long-time behavior fif the continuum part of the wave packet P (0 that we have created with the laser Jilise [Eq. (2,28)]. We can use either the outgoing or incoming states as the basis set f exfianding P (r). In what follows we shall expose the different boundary condi-hs and see which type of solution is best suited for which purpose. Substituting (2 52) in Eq. (2.28), we obtain that... 

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